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This is a work in progress.

IMPORTANT: When adding a change, write a REAL NAME of the person, not his IRC or whatever nicks. This is an official paper. Also, reference bug numbers at the end of the change, in braces, like (your name, bug #2373).

This is the changelog for ReactOS™ version 0.3.4 (released when *censored* freezes over), 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 0.3.3 (released 12 September, 2007).


Generic 0.3.4 Changes

  • Added more entries to machine.inf to install ACPI thermal zone and ACPI lid (Cameron Gutman)
  • LiveCD's now use SOS boot screen (Cameron Gutman, bug #2658)
  • XML compliance fixes for the .rbuild files (Marc Piulachs, bug #2649)
  • Define default strings in the general "version.rc" resource file, which shouldn't be overwritten by applications. (Colin Finck)
  • Update icons for Shell32, Setupapi. (Dmitry Chapyshev)
  • Se fixes related to cygwin. (Art Yerkes)
  • Fixed parsing of registry key names with double reverse solidus. (Art Yerkes)
  • Handle recvfrom with a thrown-away address, and properly handle exception locking userland buffers in afd packet path (Art Yerkes)


  • Change the file names of the Catalan translations from "ca-CA" to "ca-ES", thanks to Marc Piulachs for noticing this (Colin Finck, bug #2662)
  • Make the Shell32 translations consistent for all languages (Colin Finck)
  • Fixed typo with ";", ":", "?", "!" in French translations (Pierre Schweitzer)
  • Added/updated French translations for 3dtext, Access, Appwiz, Cmd, Desk.cpl, Deskadp, Deskmon, Downloader, Find, Joy, Liccpa, Magnify, Main, Mstsc, Ncpa.cpl, Newdev, Powercfg, Regedit, Servman, Shell32, Solitaire, Sysdm, Syssetup, Systeminfo, Telephon (Pierre Schweitzer, bugs #2530, #2531, #2766)
  • Catalan translation for Solitaire (Marc Tormo i Bochaca, bug #2580)
  • Added/updated English and German translations for Explorer, More, Shell32, Syssetup (Colin Finck)
  • Added Lithuanian translations for Logoff, Notepad, Shutdown, Sndvol32, Solitaire, WineMine (Vytis Girdzijauskas, bug #2532)
  • Added/updated Slovak translations for 3dtext, Cylfrac, Desk.cpl, Deskadp, Deskmon, Logon, Matrix, Scrnsave, Slayer, Solitaire, Starfield, Sysdm.cpl, Timedate.cpl (Mario Kacmar)
  • Added/updated Ukrainian translations for Cylfrac, FreeLDR, Input.cpl, Logon, Msconfig, Scrnsave, Starfield (Artem Reznikov, bugs #2661, #2692, #2731)
  • Added/updated Spanish translations for Fontview, Magnify, "reactos" (Setup tool under Windows), Sndvol32 (Javier Remacha, bug #2669)
  • Added Ukrainian translations for Eventvwr, Format, Regsvr32 (Rostislav Zabolotny, bugs #2685, #2686, #2764)
  • Added a Traditional Chinese translation for Cacls (Chaoming Tseng, bug #2687)
  • Updated Italian translations for Access.cpl, Ncpa.cpl (Paolo Devoti, bug #2727)
  • Added/updated Bulgarian translations for Explorer, Find, Format, Intl.cpl, Ipconfig, Logoff, Main.cpl, More, Powercfg.cpl, Regedit, Rundll32, Shutdown, Solitaire, Timedate.cpl, Userinit, Winlogon, WordPad (Станев, bug #2728)
  • Added Spanish translation for Eventvwr (Marc Piulachs, bug #2758)
  • Added Brazilian Portuguese translation for Sndvol32 (Mateus de Lima, #2768)
  • Added Russian translation for More cmd util (Koshpaev Igor and Dmitry Chapyshev)
  • Fixed Russian translations for Taskmgr, Winemine, Shell32, Syssetup (Dmitry Chapyshev)

Build Tools

  • Add an "include/host" directory for Host include files (Colin Finck)
  • Correctly define LONG_PTR, ULONG_PTR and SIZE_T in "host/typedefs.h" (Colin Finck)
  • Define WCHAR to "unsigned short" in "host/typedefs.h", so it's always 2 bytes for host tools (Colin Finck)



  • Add folder support for msvc7+ solutions and mapping of pch .h files (Gregor Brunmar)


  • Use "typedefs/host.h" instead of the Windows headers in "wine/unicode.h" and copy some needed definitions from the "winnls.h" (Colin Finck)


  • Use "typedefs/host.h" instead of the Windows headers in "wmctypes.h" (Colin Finck)


  • Use "typedefs/host.h" instead of the Windows headers in "wrctypes.h" and add a "wrcrostypes.h" for all needed definitions from the Windows headers (Colin Finck)


Kernel and Executive (NTOSKRNL)



  • Improve KDBG symbol loading mechanism, while still maintaining compatitibility when compiled with KDBG=0 (Aleksey Bragin)
  • The debug object created by NtCreateDebugObject() is restricted to DEBUG_OBJECT_WAIT_STATE_CHANGE, change to DEBUG_OBJECT_ALL_ACCESS. (Timo Kreuzer, bug #2310)
  • Turn KDBG into KD-wrapper (Aleksey Bragin)


  • NtLoadDriver APIs refactor/improvent (Aleksey Bragin)
  • Almost completely fix the hack in IopParseDevice which was resulting in "FIXME: Broken Parse due to invalid DesiredAccess" messages, by changing some calls to IoGetDeviceObjectPointer to use FILE_READ_ATTRIBUTES instead of FILE_READ_DATA (so that the volume doesn't get mounted) (Aleksey Bragin)
  • Implement IoCheckEaBufferValidity() (Daniel Zimmerman)


  • Implement KiTrap19 handler (XMMI exceptions, mostly copied KiTrap7 handler and used mxcsr status word and exceptions there). (Aleksey Bragin)
  • Dynamically enable it, if CPU supports XMMI (was already done in the kernel, but #if0-ed). (Aleksey Bragin)
  • Fixed a typo in the line which lead to actual zeroing of mxcsr, instead of zeroing only reserved bits (spotted by Kamil Hornicek aka "Pigglesworth")
  • SSE/SSE2/etc is not broken anymore (Aleksey Bragin, bug #2748)
  • Copy kernel's IDT entries to the IDT we've got from the bootloader. Fixes boot-process initiated by ntldr-compatible loaders (Aleksey Bragin)
  • KeRosCaptureUserStackBackTrace is now created, which calls RtlWalkFrameChain with the user-mode flag, meaning that bugchecks finally show the user-mode stack again! (Aleksey Bragin)
  • KeRosDumpStackFrames is fixed so that if the EIP can't be found in a module list, it's still displayed (just without the module name). Previously the EIP would not be shown, resulting in code running on the heap/stack/somewhere else not being shown as part of the trace (Aleksey Bragin)
  • Coalesce all calls to MmUpdatePageDir through a single inlined function - MiSyncProcessThreadViews, and fix callers which assumed that the kernel stack is KERNEL_STACK_SIZE, when in fact, it may be KERNEL_LARGE_STACK_SIZE. We now detect and handle this, fixing a bug in KiAttachProcess. (Aleksey Bragin)
  • Unlock address space before raising to HIGH_LEVEL in KeBugCheck (Aleksey Bragin, bugreports/info by Alex)
  • Fix LoaderPagesSpanned calculation (Aleksey Bragin)



  • Changed Memory Manager's early initialization to be more slightly more ntldr-compatible (Aleksey Bragin)
  • Move Teb's StaticUnicodeString initialisation from ntdll to MmCreateTeb (it's better to initialize it early, and all at once) (Aleksey Bragin)
  • Actually create (in the bootloader) and then respect the memory map (in memory manager) (Aleksey Bragin, thanks to Alex)


  • ObReferenceObjectByHandle/ObpReferenceProcessByHandle: Properly return STATUS_INVALID_HANDLE if user-mode tries to reference a kernel-mode handle
    Properly validate process/thread access rights before giving a reference to the caller. (Aleksey Bragin, thanks to Alex!)
  • Fix definition of "SizeOfHandle" macro in the handle table implementation. Fixes handle leaks at process rundown, handle allocation, and problems with processes that use more than 512 handles. (Aleksey Bragin, thanks to Alex!)
  • Remove checks for "VALID_INHERIT_FLAGS". These flags have nothing to do with handle table entries and shouldn't appear in them. (Aleksey Bragin, thanks to Alex!)


  • Fixed a bug in PnP Manager for drivers which failed initialization at boot-time (Aleksey Bragin)
  • Improved compatibility in PnP Manager, driver's load and unload routines are alwyas called in context of the system process (Aleksey Bragin)
  • Correctly set DN_DRIVER_LOADED flag. This fixes "i8042prt/kbdclass.sys get installed one more time at each boot". (Aleksey Bragin, bug #2330)


  • Fixed incompatible SeSet/QuerySecurityAccessMask() behaviour (Aleksey Bragin)

Hardware Abstraction Layer (HAL)

Run Time Library (RTL)

  • Fix multiple bugs in RtlWalkFrameChain and secure it against any possibility of a bugcheck while walking the stack. (Aleksey Bragin, bugreports and info by Alex)
  • Fix bugs in RtlUnwind and RtlExceptionDispatch which assumed the DPC stack size was 4KB instead of 12KB. (Aleksey Bragin, bugreports and info by Alex)
  • Fix multiple bugs in RtlpGetStackLimits and seure it against bugchecks. Properly detect DPC or invalid stacks. (Aleksey Bragin, bugreports and info by Alex)

Kernel Mode Drivers


  • Fixed the issue with floppy.sys hanging on boot (Cameron Gutman, bug #1508)


  • Moved the functions MOV_DD_SWP (the i486 version), MOV_DW2DD_SWP and MOV_DW_SWP to an external assembler file (Colin Finck)
  • Silence many warnings (Colin Finck)
  • Fix a bug, where all ATI chips were treated as Silicon Image chips (Colin Finck)
  • Make building with QUEUE_STATISTICS turned off possible (Samuel Serapión)

NT System Library (NTDLL)

Static Libraries



  • Fixed exception handling, and C++ specific exception handling in CRT/MSVCRT. Thanks to this most of MFC apps are now working. (Aleksey Bragin)


Win32™ Personality

User mode subsystem server (CSRSS)

  • Fixes updating default character attributes when calling SetConsoleTextAttribute() (Thomas Bluemel)
  • Fix console painting bugs (Thomas Bluemel)

User mode subsystem client (USER32)

  • Translate pointers in ValidateHandle to the user mode mapping (Thomas Bluemel)

Kernel-mode subsystem server (Win32K)

  • Made EnumDisplaySettings work (Gregor Brunmar, bug #2584)
  • Enable the Windows Server 2003 behaviour for SetTimer (Colin Finck)
  • Extend hack in NtUserEnumDisplayDevices to fail enumerating monitors. Fixes an infinite loop in deskmon.dll (Thomas Bluemel)
  • Tweak the ScrollDC implementation a bit so that it produces a better output (Thomas Bluemel)
  • Optimize FrameRgn for simple rectangular regions (Thomas Bluemel)
  • Keep callproc handles valid as long as a window classes exists (Thomas Bluemel)
  • Dereference callproc handles without a system call (Thomas Bluemel)
  • Expose the pointer to the shared heap and the delta to the user mode mapping (Thomas Bluemel)

Control panel applets


  • Change listbox to listview, draw icons, add a find bar. "Install" button moved to a separate tab, also buttons "Download!" and "Find in the Internet" are added there too. Applet's width increased. Make the "Information" tab work. Other changes (Dmitry Chapyshev)
  • Process window messages while the (un)installer is running and disable it (Thomas Bluemel)
  • Don't call SHBrowseForFolder() with random pointers (Thomas Bluemel)


  • Display advanced display settings and allow shell extensions to extend it. Not yet fully functional/working (Thomas Bluemel)
  • Allow changing the screen resolution in the advanced adapter settings through desk.cpl (Thomas Bluemel)
  • Add a (not yet functional) control to allow the user to arrange the monitors (Thomas Bluemel)
  • Display monitor number and various bug fixes (Thomas Bluemel)
  • Add ability to change/query single monitors and change/query the current selection in the monitor arrangement control (Thomas Bluemel)
  • Allow altering the monitor arrangement control behavior flags (Thomas Bluemel)
  • Fix displaying the window caption height (SM_CYCAPTION includes SM_CYBORDER) (Thomas Bluemel)
  • Send notification if another monitor is selected (Thomas Bluemel)
  • Display a context menu for the selected monitor (Thomas Bluemel)
  • Check if reading theme settings from the registry was successful (Thomas Bluemel)
  • Add very basic dragging support to the monitor selection control (Thomas Bluemel)
  • Allow selecting monitors using the keyboard (Thomas Bluemel)
  • Initialize the COM library (Thomas Bluemel)
  • Destroy created pen after use (fixes a GDI object leak) (Thomas Bluemel)




  • Implemented the network status property applet to show the actual info (Gregor Brunmar)


  • Don't change the current power scheme when displaying the dialog (Thomas Bluemel)
  • Load additional pages provided by shell extensions (Thomas Bluemel)


  • Added the build date and revision number to sysdm.cpl (Samuel Serapión, bug #2683)
  • Display the processor frequency and RAM size with the correct decimal separator based on the current locale (Colin Finck)


Win32™ Applications

3D Text OpenGL Screensaver



  • Fix memory leaks/wrong heap usage by replacing calls to _tcsdup with cmd_dup (Thomas Bluemel)
  • Display a list of all leaked memory blocks when terminating (Thomas Bluemel)


  • Changed and updated the links to Firefox and Thunderbird (Colin Finck)
  • Options added: save or delete files after download, and choose download directory (Dmitry Chapyshev)
  • Display basic download status (Thomas Bluemel)
  • Hackfixed Download! to get it working under ReactOS (Pierre Schweitzer)


  • Added an Event Log Viewer (Marc Piulachs, bug #2602)
  • Hardcoded the Window class string, there is no reason for it to be in localized resource files (Colin Finck)


  • Added a LogEvent utility for adding an event to the EventLog (Marc Piulachs)
  • Accept the input parameters case-insensitive and replace the "/h" option by a "/?" option (Colin Finck)


  • Hardcoded the Window class string, there is no reason for it to be in localized resource files (Colin Finck)
  • Removed duplicate header inclusions (Colin Finck)

Matrix Screensaver

  • Set g_nMatrixSpeed to 10 as the default value. This makes it working correctly under Windows XP SP2 and Windows Server 2003 again (Colin Finck)


  • Compute some metrics based on the card metrics, which were formerly hardcoded.
    This enables us to use the Bavarian cards.dll and theoretically cards in any size (Colin Finck)
  • Compute the card offset for the row stack based on the height of the card (Colin Finck)
  • Bugfix: When you used the 1-card-mode before, there never was a card behind the one, which you drag from the pile.
    Now Solitaire collects all the cards from the deck in the 1-card-mode like Windows Solitaire does. (Colin Finck)
  • Make it possible to use the "O" and the "X" sign as empty images for a deck.
    Actually make use of the "O" sign for the deck. (Colin Finck)
  • Use StretchBlt with fixed values for drawing the card backs in the Deck Options dialog.
    This way the dialog looks normally, also with bigger cards like the Bavarian ones. (Colin Finck)




  • Ensure that the "Name" column will always be shown, so a Registry setting can't influence it. (Carlo Bramini, bug #2217)
  • Taskmgr could already be compiled only when Unicode compilation was enabled.
    Make this obvious now by replacing all TCHAR's and TCHAR functions with WCHAR's and wide-character functions and getting rid of the "tchar.h" inclusion. (Colin Finck)
  • Fixed a handle leak (Pierre Schweitzer, bug #2772)

Win32™ Libraries


  • Port RegLoadMUIStringA/W from WINE HEAD and adjust parameter names (Thomas Bluemel)
  • Load libraries as data files in RegLoadMUIString (Thomas Bluemel)


  • Merge the card bitmaps of "cardsbav" to our cards.dll and specify with preprocessor definitions, which cards shall be compiled into the DLL (Colin Finck)


  • Add initial implementation of the display adapter desk.cpl shell extension (Thomas Bluemel)
  • Display the display device adapter name and show device properties (Thomas Bluemel)
  • Display adapter information (Thomas Bluemel)
  • Implement the "List all modes" dialog, read-only for now (Thomas Bluemel)
  • Select currently selected mode by default (Thomas Bluemel)
  • Display the display adapter properties with extended pages (Thomas Bluemel)
  • Set the current device mode selection to the current one if the mode was changed successfully (Thomas Bluemel)


  • Add an initial implementation of the display monitor shell extension for desk.cpl (Thomas Bluemel)
  • Display a list of monitors if there's more than one monitor (Thomas Bluemel)
  • Display a list of available refresh rates for the current mode (Thomas Bluemel)
  • Allow changing the display refresh frequency (Thomas Bluemel)


  • Implement DevicePropertiesA/W by calling DevicePropertiesExA/W and move function prototypes to a private header (Thomas Bluemel)
  • Fix implementation of DevicePropertiesA/W to show extended pages (Thomas Bluemel)





MME API (WinMM / MMSystem)

  • Added registry key enumeration for "Drivers" and "Drivers32" in place of the WINE-specific code (and hard-coded MIDI and wave mappers) for determining user-mode drivers that require loading (Andrew Greenwood)



  • Fix freeing lists on process detach (Thomas Bluemel)
  • Make initializing the ICD in ROSGL_ICDForHDC thread-safe (Thomas Bluemel)
  • Delete all GLDCDATA structures in wglDeleteContext that share the same ICD (Thomas Bluemel)


  • Call ShellExecute with NULL instead of "open", so the default action will always be used (Colin Finck, bug #1461)
  • Implement a new ShellAbout dialog, which looks more like the Windows one (Colin Finck)
  • Fix abusing the heap by using strdupW instead of _wcsdup (Colin Finck)


  • Enable the code to determine the time zone from the default system language (Thomas Bluemel)