Version 4.0.8

New OCA stable from tested canary. Thanks a lot for Murak, Syvatpro, Coccodrillooxds and NixxO(now he is a OCA developer, added the Thunderbird 144+ support for OCA) for all amazing work.

What's new:

• Change behaviour of New Compatibility System to child process inherit compatibility from parent to persist on registry. So now, for install Steam, you only need apply compatibility mode to Steam setup;
• Fix Office 2013/2016 installation on Server 2003 x86;
• Fix Steam running on a computador with NVIDIA GPU. Fix for VirtualBox is comming too;
• Adding patched Windows Installer (MSI) files to possibility install Msi packages what require Windows Installer 5.0. Now you can install Vmware 11-14 on XP x64, Sketchup, Itunes, Node, Python and several another applications on XP/2003/XP x64. WIndows Installer 5.0 will be added to OCA for Vista;
• Adding support for Paint .net up to 4.3.12;
• Fixed invisible menus on Visual Studio 2010+ (including 2012) when .net 4.5+ is intalled;
• Adding support for install .net 4.5+without any .net framework installed before;
• Adding fully supoort for install Java 1.8 152+ on XP/2003 x86;
• Fix issue with string, dialogs and menus in english on non-english system (native ou mui applied);
• Introducing dnsapi_wrapper to avoid AV warnings and generalize OCA;
• Adding FP40 web dlls for fix Visual Studio 2003 warnings on x86;
• Fix BeamNG on x64 by rollbacking dwrigdi;
• Fix "Document not found" on Adobe Reader under x86 by updating kernel32;
• Adding msftedit.dll to adding suport for RockstarLauncher setup;
• Solving git bash hang to close after press close button, but the fix is only applied to Server 2003 x86;
• Added suppot for firefox 152+ alpha and r3fox 150+;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• GameLoop (android emulator) installer get fatal error;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64;
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Some repack installers have problems with title bars (they don't apply the installer's special "themes") in some dialogs;
• DoubleCommander doesn't start because comctl32 requires comctlext;
• Windows Live Messenger of WIndows Live Essentials 2011/2012 Startup has 50% CPU usage ;
• Windows Live Mail from Windows Live Essentials doesn't work;
• Windows Live Movie Maker from Windows Live Essentials 2009 doesn't start on NT 5.2 because it can't find msvcr80.dll, which is in winsxs. Caused by a hack in the basesrv to "bypass" errors in the manifest;
• Skype Classic has no main window on Windows XP SP3 and hang with 50% of CPU;
• RG Mechanics repack no longer works on Server 2003 and XP x64;
• Telegram 6.x not work;
• WeChat 3.2.1 not working on XP x64;
• CorelDraw X7 crashing on startup;
• Brave/catsxp installer gives a decompression error;
• CCleaner has a regression;
• Performance Passmark 9 has an exception when running benchmarks and no animation on x64 caused by ntdll x64;
• Reported exception error when installing IE8 running the iedkcs32.dll;
• Customization for displaying My Computer, My Documents, and others on the desktop does not display icons;
• Brackets does not start after installation on x86;
• Git stopped working on XP x64 since version 4.0.4;
• Microsoft Excel 2003 crashes on Server 2003 without updates using the new Windows Installer;
• Windows Movie Maker does not display icons in the top bars on XP x64 since version 4.0.0

What's Changed

• Update README_CN.md by @jonm58 in #523
• Reflect changes in README.md to README_JP.md by @nohimazin in #529
• Updated the README by @voidxO7 in #535

New Contributors

• @voidxO7 made their first contribution in #535

Full Changelog: 4.0.6...4.0.8

Version 4.0.7

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

The OCA version management system is undergoing an update. Now, after a week or two of testing, canary versions will be rolled out to the stable versions. There is a possibility of a new experimental OCA channel in the future. Thanks a lot for Murak, Syvatpro, Coccodrillooxds and NixxO(now he is a OCA developer, added the Thunderbird 144+ support for OCA) for all amazing work.

What's new:

• Introducing Office 2013 and 2016 support for XP x86 SP3, Server 2003 SP2 x86 and XP x64 Sp2. However, it is not supported for older versions at now. The support comming soon on next OCA releases. Only msi bases installation is supported and still some issues, like Word write and render page due dwrite native not work fully and you need wined3d dlls to make work (and on VM you must need a Mesa3d to make dx11 work and it is needed); You cannot print and you can face some another issues. The solution will be avaliable on next One-Core-API releases;
• Introducing preliminary Windows Vista support on One-Core-API. Only x86 is supported at now and have some issues, You can use only firefox until 115. Chrome is supported until latest version, however steam not working for now. Also, has a issue with uninstallation, i recommend make a Restore point before try OCA on Vista;
• Introducing the new One-Core-API compatibility system. Now, One-Core-API has own settings tab called "OCA Settings" on file (exe, msi, shortcut) properties. You can set compatibility in MSI files too! The native compatibility tab now is not more updated by OCA. It's solve Windows Media Player 11 instalaltion too. Test and stress the new compatibility system;
• Added support of compatibility mode for x64 applications. It's fix steam on xp x64, since steam now is x64 application. You don't need use Windows Compatibility Tool for steam anymore. Solve for Firefox 90-115 too;
• Introducing a MMDEAVPI Wrapper made by Syvatpro. It's make WASAPI work on NT5. only one known issue with firefox and about:support page, but, the fix is comming soon. It's solve Audacitty 2.3+ issues reporting no audio device. We don't need anymore the --exclusive-audio parameter for chromium applications;
• Fix r3fox and another Direct2d and Directx11 based applications completely by add more d3dKmt functions into gdi32;
• Fixed Notepad render;
• Adding support for latest LibreOffice (2025+);
• Fixed firefox crash when Mmdevapi_wrapper is installed;
• Fixed Super Mario Bros;
• Fixed Thunderbird 144+ by adding NtQueryWnfStateData function. Thanks for NixxO;
• Gimp 2.10 seem supported by XP x64;
• Fixed Thunderbird 144+ by adding NtQueryWnfStateData function on XP x86 SP3;
• Fixed no sound on Chromium based browsers on XP x64, both x64 and x86 architectures;
• Reintroduce iphlpapi_wrapper for all platforms for avoid Avira and another AVs warnings;
• Make Tor browser work again by chaging the Chromium detection for sandbox disabler (avoid tor or firefox based browsers);
• Added partial support for Photoshop 2024 and increase stability to previous versions. Some issues remains, but will be fixed on next releases;
• Fixed Qbittorrent on x64;
• Fixed Grabber on x86 and x64;
• Adding some wrappers again to avoid AV issues;
• Added working functions into iphlpapi_wrapper
• Fixed CCleaner using 50% CPU on Server 2003;
• Fixed issues with Chrome for Windows 7 Rework, but, due it browser use a own Thread Local Storage implementation for work on XP, need run in compatibility mode to Windows Vista to work fine on XP/2003/Xp x64 with One-Core-API installed;
• Fixed exception after installation of Visual Studio Code on all platforms;
• Fixed no sound in MyPal 29/68/74/78 with update of MMdevAPI wrapper made by SvyatPro (thanks friend);
• Now Sound Volume Mixer from Vista/7 works partially on XP/2003/XP x64 after update of MMdevAPI and comctl32. However, the sound volume change is not reflected on system;
• Fixed latest applications like VS 1.111 and Legocord 1.2.0;
• Changed functions GetThreadGroupAffinity and SetThreadGroupAffinity to fix AID64 benchmark;
• Imrpovements on SRW API by Svyatpro to avoid applications errors and loose performance;
• Visual Studio 2010 splash screen seem has text again;
• Fixed no sound for notification events like Security Center notification;
• Fixed Visual Studio 2005 Installer and Application;
• Fixed Convert Music on iTunes running on XP SP3 doesn't work since OCA 4.0.3+;
• Added Support for Paint .net until 4.2.16;
• Fixed Signal application;
• Fixed Maxthon on XP SP3 x86;
• Fixed Visual Studio 2010 installation what fail to install SQL Server 2008 caused by Advapi32_wrapper (added resources to wrapper dll);
• Fixed Remote Desktop Connection close on Server 2003 x86;
• Fixed Ccleaner 6.x using 50%;
• Fixed Chrome 360 extreme browser on XP/2003/xp x64;
• Added d3d9ex_wrapper from Svyatpro with native Directx9 acceleration;
• Fixed Fireworks CS3 installer on XP x86;
• Added support for XP x64, Server 2003 and XP SP Betas to OCA;
• Added support for Notepad++ installer running on wow64 and using the new compatibility mode;
• Fixed Exception with Notepad++ x64;
• Fixed .net core;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• GameLoop (android emulator) installer get fatal error;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64;
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Some repack installers have problems with title bars (they don't apply the installer's special "themes") in some dialogs;
• DoubleCommander doesn't start because comctl32 requires comctlext;
• Windows Live Messenger of WIndows Live Essentials 2011/2012 Startup has 50% CPU usage ;
• Windows Live Mail from Windows Live Essentials doesn't work;
• Windows Live Movie Maker from Windows Live Essentials 2009 doesn't start on NT 5.2 because it can't find msvcr80.dll, which is in winsxs. Caused by a hack in the basesrv to "bypass" errors in the manifest;
• Skype Classic has no main window on Windows XP SP3 and hang with 50% of CPU;
• RG Mechanics repack no longer works on Server 2003 and XP x64;
• Telegram 6.x not work;
• WeChat 3.2.1 not working on XP x64;

Version 4.0.6

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This version has some improvements. Thanks Murak, Syvatpro, Coccodrillooxds and NixxO(now he is a OCA developer, added the Thunderbird 144+ support for OCA) for all amazing work.
You can see all improvements in follow list:

What's new:

• Reintroduce Antivirus support into One-Core-API. It's fix several BSODs caused by AV what delete crucial One-Core-API files;. The follow AVs were testeds: Avast, AVG, MalwareBytes, Avira and Nod32. Please test another AVs and report for me;
• Fix r3fox and another Direct2d and Directx11 based applications completely by add more d3dKmt functions into gdi32;
• Enabling again Win32ss original to fix Opera Installer. It's broken partially notepad++ and another Direct2d based applications, what will be fixed when new One-Core-API compatibility system will be avaliable;
• Adding support for latest LibreOffice (2025+);
• Fixed firefox crash when Mmdevapi_wrapper (avaliable on Canary) is installed;
• Fixed Pand Shutdown system when installed;
• Fixed Avast UI by replacing wlanapi from vista with Xp version;
• Fixed kernelex/kernelbase deletion by AV just by change the foward functions from another dlls to require directly the functons on dlls;
• Fixed Super Mario Bros;
• Fixed Thunderbird 144+ by adding NtQueryWnfStateData function. Thanks NixxO;
• Fixed BSOD when try run API monitor on all platforms;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• Tor Browser stopped work;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• GameLoop (android emulator) installer get fatal error;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64 (seem regression);
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• CCleaner using 50% CPU on Server 2003;
• Some repack installers have problems with title bars (they don't apply the installer's special "themes") in some dialogs;
• DoubleCommander doesn't start because comctl32 requires comctlext;
• Windows Live Messenger of WIndows Live Essentials 2011/2012 Startup has 50% CPU usage ;
• Visual Studio 2010 splash screen without text;
• Windows Live Mail from Windows Live Essentials doesn't work;
• Convert Music on iTunes running on XP SP3 doesn't work on OCA 4.0.3+;
• Windows Live Movie Maker from Windows Live Essentials 2009 doesn't start on NT 5.2 because it can't find msvcr80.dll, which is in winsxs. Caused by a hack in the base srv to "bypass" errors in the manifest;
• Skype Classic has no main window;
• RG Mechanics repack no longer works on Server 2003 and XP x64;
• Visual Studio 2003 installer not call itself;
• Telegram 6.x not work;
• WeChat 3.2.1 not working on XP x64;

Version 4.0.5

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is a stable release with some improvements. Thanks Murak, Syvatpro and Coccodrillooxds for all work
You can see all improvements in follow list:

What's new:

• Fixed sandbox on 50-109 chromium stopeed work. Is was caused by the chromium detection what was not working in child processes;
• Fixed VMware 10 has an error when starting a virtual machine for the first time on XP x86 SP3;
• Fixed Direct2d;
• Fixed Black screen on games and notepad++. However, it's introduce again some errors;
• Fixed Activation Issue with XP RTM and SP1;
• Adding preliminary support for LH 5000 series;
• New SRW implementation what fix Intellij 2025+ programs;
• Fix Save PNG image on MSPaint;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• Tor Browser stopped work;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• GameLoop (android emulator) installer get fatal error;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64 (seem regression);
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• CCleaner using 50% CPU on Server 2003;
• Some repack installers have problems with title bars (they don't apply the installer's special "themes") in some dialogs;
• DoubleCommander doesn't start because comctl32 requires comctlext;
• Windows Live Messenger of WIndows Live Essentials 2011/2012 Startup has 50% CPU usage ;
• Avast UI is broken;
• Visual Studio 2010 splash screen without text;
• Windows Live Mail from Windows Live Essentials doesn't work;
• Convert Music on iTunes running on XP SP3 doesn't work on OCA 4.0.3+;
• Windows Live Movie Maker from Windows Live Essentials 2009 doesn't start on NT 5.2 because it can't find msvcr80.dll, which is in winsxs. Caused by a hack in the base srv to "bypass" errors in the manifest;
• Skype Classic has no main window;
• RG Mechanics repack no longer works on Server 2003 and XP x64;
• Visual Studio 2003 installer not call itself;
• Telegram 6.x not work;
• WeChat 3.2.1 not working on XP x64;

Version 4.0.4-hotfix

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is a hotfix version of OCA stable release (4.04) with some improvements. Thanks Murak, Syvatpro and Coccodrillooxds for all work
You can see all improvements in follow list:

What's new:

• Fixed Supermium 138 x64 crash tab on some sites on XP x64 by update api-set dlls;
• Fixed VirtualBox 5.x on Windows XP x86 by rollbacking credui.dll;
• Fixed Steam crash on XP x86;
• Updated UiAutomationCore.dll version to prevent override XP x86 update;
• Fixed Steam Installation on XP x64 by updating offline root cert update installation method;
• Update some dlls base addresses to prevent colisions;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• Tor Browser stopped work;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64 (seem regression);
• OBS report no GPU drivers avaliable;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);
• CCleaner using 50% CPU on Server 2003;
• Some repack installers have problems with title bars (they don't apply the installer's special "themes") in some dialogs;
• DoubleCommander doesn't start because comctl32 requires comctlext;
• Windows Live Messenger of WIndows Live Essentials 2011/2012 Startup has 50% CPU usage ;
• Avast UI is broken;
• Visual Studio 2010 splash screen without text;
• Windows Live Mail from Windows Live Essentials doesn't work;
• Convert Music on iTunes running on XP SP3 doesn't work on OCA 4.0.3+;
• Windows Live Movie Maker from Windows Live Essentials 2009 doesn't start on NT 5.2 because it can't find msvcr80.dll, which is in winsxs. Caused by a hack in the base srv to "bypass" errors in the manifest;
• Skype Classic has no main window;
• VMware 10 has an error when starting a virtual machine for the first time on XP x86 SP3;
• RG Mechanics repack no longer works on Server 2003 and XP x64;
• Visual Studio 2003 installer not call itself;
• Telegram 6.x not work;
• WeChat 3.2.1 not working on XP x64;

Version 4.0.4

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is a next OCA stable release with some improvements. Thanks Murak, Syvatpro and Coccodrillooxds for all work
You can see all improvements in follow list:

What's new:

• No more Windows File Protection prompts on any systems (specially x64);
• Fixed icon extraction on XP x64 introduced on version 4.0.3 with png icon support.
• Office 2013 x86 installer closes silently on XP x64 (but keep not installable);
• Fixed wxHexEditor and another applications would not start and caused Explorer to close;
• Fixed SumatraPDF version 2.1.3 open PDF;
• Fixed toolbar on SumatraPDF;
• Fixed toolbar on notepad++;
• WFFontcache 4.0 crashes when trying to open Visual Studio 2010 on XP x64;
• Fixed Visual Code process remains in memory after closing - Only versions above 1.74
• Fix Office 2010 installation on XP x64 by replacing propsys;
• Fix installation of updates that stopped at 4.0.3;
• Fix installation of .NET Framework 3.5 what stopped at 4.0.3;
• Fixing shortcut creation through system updates (shellex)
• Fixing Android Studio 2025 (and probably all JetBrains 2025 apps) by updating the SRW API;
• Updating the SRW API based on ReactOS;
• Adding The Sims 3 support into XP RTM/SP1;
• Fixing x64 SP1 Installation;
• Updating bcrypt to support the new QtCreator;
• Windows Messenger is crashing on x64 if you click "click to sign"
• Now Cert update is offline;
• Fixed Itunes 7.5 on systems;
• Improved compatibility on x86 by using Aclayers from XP x64;
• Improved compatibility and stability with Photoshop 2019-2021;
• Updated bcrypt to support new QtCreator (x64 only);
• Partial support of newer firefox (14x) by add a variable what disable crash reporter);
• Introducing Dwrite_wrapper for dynamic select dwrite (dwritecore for chromium apps and dwrgdi for another applications) and make interoperability with Direct 2d (d2d1);
• Fix Python 3.6.0a and another applications with manifest issue;
• Hack on CompareStringW to fix Python tests and give Prospsys from Windows 7 support;
• Updating credui for Windows 7 beta (6801) to give some new functions;
• Updateing esent with functions required by Windows Live Movie Maker 2011+;
• Fixed IconFx (again);
• Fixed DVD Decrypter ver 3.5.4.0;
• Fixed Windows Calculator from Windows 7 switch mode;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• Tor Browser stopped work;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64 (seem regression);
• OBS report no GPU drivers avaliable;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);
• CCleaner using 50% CPU on Server 2003;
• Some repack installers have problems with title bars (they don't apply the installer's special "themes") in some dialogs;
• DoubleCommander doesn't start because comctl32 requires comctlext;
• Windows Live Messenger of WIndows Live Essentials 2011/2012 Startup has 50% CPU usage ;
• Avast UI is broken;
• Visual Studio 2010 splash screen without text;
• Windows Live Mail from Windows Live Essentials doesn't work;
• Convert Music on iTunes doesn't work on OCA 4.0.3+;
• Windows Live Movie Maker from Windows Live Essentials 2009 doesn't start on NT 5.2 because it can't find msvcr80.dll, which is in winsxs. Caused by a hack in the base srv to "bypass" errors in the manifest;
• Skype Classic has no main window;
• VMware 10 has an error when starting a virtual machine for the first time on XP x86 SP3;
• RG Mechanics repack no longer works on Server 2003 and XP x64;
• Visual Studio 2003 installer not call itself;
• Telegram 6.x not work;
• WeChat 3.2.1 not working on XP x64;
• Supermium 138 x64 crash tab on some sites;

Version 4.0.3

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is a next OCA stable release with some improvements. You can see all improvements in follow list:

What's new:

• Introducing support PNG Icon, like as on Windows Vista. It's fix Notepad++ loadIcon, .Net framework 4.6+ installer (not crash anymore), git 2.4x load icon and possibility several another apps. Also, the icons of installer's git, floorp, librewolf and another programas are displayed correctly. And it will be the base for future LH/Vista/7 Shell packs for XP/2003.. The implementation is on user32_wrapper and use libpng;
• Fixed Chrome 141 crash if click on any button by adding missing function to UIAutomationCore;
• Fixed installation on Server 2003 RTM and OpenXP using custom kernel;
• Fixed Chrome 49 on XP RTM by add SP3 imm32;
• Fixed .Net 4.7.2+ installation by replacing wintrust with vista version (what add sha2 certificates support);
• Fixed parcially d2d1, what fix IconFx missing icons issue;
• Not sure if is introduced on this version, but now Photoshop 2020 run on XP x64, however, always will crash at first try;
• Not sure if is introduced on this version, but now NFS Rivals start on XP;
• Not sure if is introduced on this version, but grabber works fine;
• Not sure if is introduced on this version, but slack seem working;
• Not sure if is introduced on this version, but Windowed seem working;
• Fix for firefox maximize, minimize and close buttons by added Windows 10 Fonts;
• Fixed install printer on XP x64 and Server 2003 x86/x64

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• Electron apps (like Visual Code) keep in memory after close what seem caused by gpu/wined3d issue. Try add "--disable-gpu" parameter on shortcut and choose "disable gpu acceleration on application settings ;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Explorer 32 bits crash if you try start on XP x64;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64 (seem regression);
• OBS report no GPU drivers avaliable;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);

Version 4.0.2-Hotfix

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is a hotfix OCA stable release for previous OCA release with some improvements. You can see all improvements in follow list:

What's new:

• Fixed not open downloaded files from web by update crypt32 and cryptex;
• Fixed Supermium on NT 5.2 (server 2003 and xp x64) by update ntext, kernelex and shlwapi;
• Updated some binaries to decrease memory usage on XP SP3 and XP x64;
• Fixed dxdiag and dx10 games when use wined3d;
• Fixed .net 4.0+ installation on XP adding loadperf;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working file (except cannot load icon, due is png ico);
• Electron apps (like Visual Code) keep in memory after close what seem caused by gpu/wined3d issue. Try add "--disable-gpu" parameter on shortcut and choose "disable gpu acceleration on application settings ;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Explorer 32 bits crash if you try start on XP x64;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Netbeans 8.x seem not work on XP/2003 x86;
• Adobe Reader DC not install on XP x64 (seem regression);
• Grabber crash;
• OBS report no GPU drivers avaliable;
• Slack report error on xp/2003 x86 and crash on XP x64 (seem regression);
• Windowed stopped work on xp x64 (regression);
• Newer firefox can not work on XP x86 SP1;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);

Version 4.0.2

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is the next OCA stable release with a lot fixes and improvements. You can see all improvements in follow list:

What's new:

• Swapping Wined3d with native D3D runtime from Windows 7 platform update. It's was made to increase stability and compatibility with applications, due wined3d has several issues with Intel , AMD and VirtualBox/Latest VMWARE GPU. However, it is sotfware render, so, very slow and cannot run game;
• Wined3d keep avaliable on (Drive what Windows is installed):\Windows\System32\wined3d. Also, will be released a OCA extra package for install Wined3d and replace native d3d. If you want run a game, make sure has NVIDIA GPU and install or copy files from (Drive what Windows is installed):\Windows\System32\wined3d;
• Replace crypt32 from Vista version. It's fix a lot certificate issues;
• Implemented a checker for if OCA already installed. You need uninstall older version for install new;
• Improve Steam on Server 2003, XP x64 and partially on XP x86. On XP x86 keep highly unstable and keep on investigation. If you know a way to improve stability of Steam, please tell me!;
• Fixed XP x86 memory usage when use a chromium based application, except steam, the memory/virtual memory usage is same than XP and Server 2003;
• Fixed Spotify for Windows 10 missing functions and login; However, seem crash when try play a music or playlist;
• Swapping custom kernel with original untouched kernel to improve stability;
• Replaced dwrite from wine with DwriteCore;
• FIxed Vmware 10 on XP SP3; However, on first vm startup, you will get error. Try again and it will work;
• Fixed VirtualBox on XP x64;
• Fixed VirtualBox VM startup on XP x86;
• FIxed OCA installation on XP x86 SP1;
• Fixed Need for Speed Hot Pursuit 2 and Need for Speed Porsche Unleashed game;
• Fixed Node on XP x86;
• Fixed DOS 16 bits applications on XP and Server 2003;
• Fixed Sony Vegas 10 get error on Startup.
• Fixed Samsung PC Studio;
• Fixed Winamp database error. Very old issue;
• Fixed Avast on XP x86, Server 2003 and XP x64. However, it's seem don't like OCA files, some applications can stop work after AV delete "suspect" files (false positive);
• Introducing a new sandbox disabler, for every chromium based application. You can try enable sandbox adding "-enable-sandbox" parameter on application shortcut;
• FIxed Inno Setup Installer;
• Introducing three OCA x86 installer version: standard, avx and pae. Standard contains original kernel without modification., avx with partial avx support on XP x86 SP3 (patched kernel) and pae, with AVX and PAE patches. PAE version maybe can cause BSODs, be careful;. No changes for Server 2003 and xp x64;
• Fixed 0xDEADBEEF BSOD when use some ported driver what use ntoskrnl_emu;
• Fixed codec issue on XP x64;
• Maybe fixed Hibernation/Sleep issues on x64;
• Fixed missing function on Opera Browser Assistant;
• Now, Opera first tutorial works fine;
• Fixed svchost issue when use Windows Compatibility Tool;
• Chrome 126+ now works on LH 5001, WIndows NCode and systems with MUI Installed;
• Fixed process cmd/wmic creation leak when use legocord or armcord;
• Maybe Fixed issues with BSOD on XP x86 and XP x64;
• Fixed VLC crash when try play a video on VirtualBox;
• Probably fix for Chromium based browsers starting 126 on systems not english;
• Maybe fixed error with sumatra PDF:
• OCA was optimized and now use less VM on Server 2003/XP x64;
• Now you can use wined3d compiled from https://fdossena.com/?p=wined3d/index.frag

Known issues:

• Every downloaded from browser file don't run;
• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working file (except cannot load icon, due is png icon);
• Electron apps (like Visual Code) keep in memory after close what seem caused by gpu/wined3d issue. Try add "--disable-gpu" parameter on shortcut and choose "disable gpu acceleration on application settings ;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Explorer 32 bits crash if you try start on XP x64;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Netbeans 8.x seem not work on XP/2003 x86;
• Adobe Reader DC not install on XP x64 (seem regression);
• Grabber crash;
• OBS report no GPU drivers avaliable;
• Slack report error on xp/2003 x86 and crash on XP x64 (seem regression);
• Windowed stopped work on xp x64 (regression);
• Newer firefox can not work on XP x86 SP1;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);

Version 4.0.1

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is the next OCA stable release with fixes and improvements. You can see all improvements in follow list:

What's new:

• Reverting Wined3d to version 8.20 to get compatibility with non-3d accelerated GPU, like VirtualBox;
• Fix for Black Screen with mouse on XP x64 and Server 2003;
• Fixed Remote desktop connection visual desconfiguration;
• Fixed notepad from Windows Vista or 7 not search anything;
• Fixed checkbox duplication on Internet Options;
• Fixed Qualcomm Atheros Wifi Driver Code 10 error on xp x64;
• Fixed BSOD 0xDEADBEEF related with ntoskrnl_emu;
• Fixed issues with Longhorn 5001;
• Now uxtheme is patched by default;
• Fix AMD PCNET driver code 10 error on Longhorn 5001;
• Fixed issue with Video on Qemu KVM-Linux;
• Fixed VirtualBox on XP x64;
• Added support for use d3d9 from Vista;
• Fixed Notepad++ not adding context menu entry;
• Fixed Sony Vegas 10 get error on Startup.

Known issues:

• On Some Windows installation languages you can face empty window on MMC applets: you can go to C:\Windows\mui\fallback and detele mmc.exe.mui and mmcbase.dll.mui;
• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working file (except cannot load icon, due is png icon);
• Virtual Box machines not work on XP SP3 with error on VM startup. And x64 get delay on operations ;
• Electron apps (like Visual Code) keep in memory after close what seem caused by gpu/wined3d issue. Try add "--disable-gpu" parameter on shortcut and choose "disable gpu acceleration on application settings ;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Explorer 32 bits crash if you try start on XP x64;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• XP SP3 maybe get BSOD in Core 2 duo generation notebooks;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• Chromium based applications on XP SP3 only has virtual memory optimization only at second time of you start application;