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Developers: If you are looking for the SVN commit log between the 0.3.0 branch and the 0.3.1 rebranch, you can download it here:

This is the changelog for ReactOS™ version 0.3.1, an open-source operating system designed to be binary executable- and device driver-compatible with Microsoft™ Windows NT™ and subsequent Microsoft operating systems such as Windows 2000™ and Windows XP™. ReactOS is written by the ReactOS development team, and the last previous version of ReactOS was version 0.3.0 (released 27 August, 2006).

Highlights of this Release


Full Changelog


Generic 0.3.1 Changes



ReactOS Core

Kernel and Executive (NTOSKRNL)

Run Time Library (RTL)

Kernel Mode Drivers


Win32™ Personality

Kernel-mode subsystem server (Win32K)

  • New keyboard driver and layout structure implemented (James Tabor)
  • Have IntSystemParametersInfo send WM_SETTINGCHANGE when needed (Timo Kreuzer)
  • Bug : 843: Patch from (Timo Kreuzer) which removed focus from windows
  • NtUserSetFocus accepts Null window (Timo Kreuzer)
  • same strechblt code for 8,16,32, it does not using putpixel anylonger for 8bpp and 32bpp, and small cleanup (Magnus Olsen)
  • Last part of the new strectsblt remove all mul and div from the loop (speed incress). (Magnus Olsen)
  • commit freetype cache glyth patch, orginal author of this patch is royce3, modify by tinus so it work again with trunk, ThePhysicist (timo dot kreuzer at web dot de) did fix the last bugs in it. at last long leave freetype glyth patch, now we got faster text output in reactos. and I where up to 38fps in winquake with this patch (debugbuild + serial debug on). This is very fast. I wonder what speed it give in release build or qemu now. See bug 511 for more details. (Magnus Olsen)
  • Implemented NtUserDrawCaption (Saveliy Tretiakov)
  • Implemented NtGdiGetPath, NtGdiPathToRegion, NtGdiFlattenPath, NtGdiCloseFigure, NtGdiStrokePath, NtGdiStrokeAndFillPath (Saveliy Tretiakov)
  • Implemented NtGdiPolyDraw (Saveliy Tretiakov)
  • remove fireball hack in changedisplay(), do not hard code the display number,

with this patch we are now extract the display number from the desktop and use it patch was wroten by me and janderwald. I was to lazy finish it so janderwald did finish it thanks janderwald. (greatlord)

Control Panel Applets

  • Added currency controls with format information (Eric Kohl)
  • Hit-testing added for caption buttons in Display properties - Appearance tab(Eric Kohl)


  • Sysdm has been overhauled and now looks more like XP's (Ged Murphy)
  • Added CPU detection (Colin Finck)
  • Colin Finck (mail at colinfinck dot de) patch to sysdm (id=1161) fixing truncate of string and making allot better layout of the system info. See issue #1858 for more details. (commited by greatlord)

Win32™ Applications




  • Added the Download! Utility for downloading various free software (Maarten Bosma)


  • Explorer does not leak icons and bitmaps anymore (see bug 1554) (Timo Kreuzer)



  • Read the shell name from HKCU, if it does not exist fall back to HKLM, if this does not exist use "explorer.exe" and "cmd.exe" (Hervé Poussineau)

Win32™ Libraries


  • Implemented TOOLTIPS_NotifyFormat, now returns the type of the string (Timo Kreuzer)


  • Fix the calc bug, modf is compelete wrong, replace it with DJGPP C version of modf with small changes from me. so it compile in ReactOS, Follow bugs did I notice in our modf 1. bug did not clear the st reg before it was use, 2. bug did not load the reg right, 3. bug did not handler all case (greatlord)

DirectX Libraries


  • Implemented NtGdiPolyDraw, based on Wine's Implementation (Saveliy Tretiakov)
  • fixed a bug in DdDeleteDirectDrawObject Zero the DirectDraw handler, if it is successfull memory is free'd(Magnus Olsen)


  • Fix some window focus issues (Timo Kreuzer)
  • bug 1486 : patch from w3seek USER32: Convert WM_MDICREATE messages from/to unicode

3rd Party Software

  • Update Zlib from 1.1.4 to 1.2.3 fix some memory leaks (Magnus Olsen)
  • Updated DejaVu Font to Version 2.13 (Magnus Olsen)
  • Updated Buslogic Driver to Version (see bug 1891) (Christoph von Wittich)
  • Freetype, small speed in-cress, remove Freetype ros glue C version of memcpy, memcmp, isalnum, labs and replace it from reactos string.a we got asm version of most of them, so that is reason to the speed in-cress of Freetype (Magnus Olsen)


  • Improved Compatibility with Intel Macs (Michael Steil)
  • commit the patch from bug 1874 even it does not use the RDMSR and WRMSR measure methood, we need use the RDMSR and WRMSR for dual core and CPU support it see Intel documentations AP-485, who u should do it. The patch is from HTO Bugfix detections of RTSC support for single and dual core by me, adding check if the CPU support RDMSR and WRMSR and send a true or false value to GetCpuSpeed, so we known which method we should use. HTO patch should be use when it is false. other wise we should use the RDMSR and WRMSR measure method See issue #1874 for more details. (greatlord)