A free Windows-compatible Operating System - mirrored from GitHub
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Katayama Hirofumi MZ 089788a52a
[SHELL32][SHELL32_APITEST] ShellExecute should accept invalid directory (#7150)
Implement parsing SHELLEXECUTEINFO.lpDirectory.
Enhance ShellExecuteEx testcase for invalid directory.
2024-07-19 17:40:36 +09:00
.github [GITHUB] Fix toolset version for MSVC 17.10 (#6997) 2024-06-07 01:22:20 +03:00
base [RAPPS] Add new Let's Encrypt issuer certificate 2024-07-18 21:59:14 +02:00
boot [INF] Update Romanian (ro-RO) translation (#6859) 2024-07-16 21:38:44 +02:00
dll [SHELL32][SHELL32_APITEST] ShellExecute should accept invalid directory (#7150) 2024-07-19 17:40:36 +09:00
drivers [PARTMGR] Filter some currently-unimplemented MountMgr MOUNTDEV notifications. 2024-07-17 17:24:26 +02:00
hal [HAL:APIC] Fix HalSetTimeIncrement 2024-06-15 14:22:20 +02:00
media [INF] Update Romanian (ro-RO) translation (#6859) 2024-07-16 21:38:44 +02:00
modules [SHELL32][SHELL32_APITEST] ShellExecute should accept invalid directory (#7150) 2024-07-19 17:40:36 +09:00
ntoskrnl [NTOS:IO] IopCreateArcNamesDisk(): Fix the ArcName link creation condition check. 2024-06-19 17:26:40 +02:00
sdk [SDK][MC] errcodes.mc: Added more COM error messages (#7142) 2024-07-16 21:52:23 +02:00
subsystems [KERNEL32][PSDK][NTVDM][CONSRV] Use now-documented ReadConsoleInputEx() flag names. 2024-03-06 12:28:27 +01:00
win32ss [COMCTL32][USER32] STATIC: Fix grayed drawing (#7024) 2024-07-18 22:03:36 +02:00
.editorconfig Remove the 'end_of_line' value. Addendum to 32db19f6 - PR #2528 2020-04-11 17:56:23 +02:00
.gitignore [GIT] Add .DS_Store files to .gitignore (#4762) 2022-10-08 13:18:18 +02:00
.gitmessage [FORMATTING] Remove trailing whitespace. Addendum to 34593d93. 2021-09-13 03:52:22 +02:00
.gitpod.Dockerfile [GITPOD] change extract directory to automatically extract to RosBE, and set tar to verbose mode 2021-12-28 02:14:47 +03:00
CMakeLists.txt [CMAKE] Use baseaddress64.cmake for all 64 bit builds 2023-11-10 19:20:24 +02:00
CODEOWNERS Rework apisets to use a table 2024-04-27 22:51:34 +02:00
configure.cmd [CONFIGURE] Add support for MSVC Toolset 19.4x (#6677) 2024-03-27 21:04:18 +03:00
configure.sh [CONFIGURE] Make configure.sh print out an error when CMake fails 2021-08-02 01:40:43 +03:00
CONTRIBUTING.md [DOCS] Update contributing rules and PR management (#4881) 2023-07-24 00:58:56 +03:00
COPYING.ARM [FORMATTING] Remove trailing whitespace. Addendum to 34593d93. 2021-09-13 03:52:22 +02:00
CREDITS [CREDITS] Add myself to the credits document (#2747) 2020-05-07 12:39:44 +02:00
INSTALL [REACTOS] Remove some ending spaces 2020-04-24 02:32:05 +03:00
PULL_REQUEST_MANAGEMENT.md [DOCS] Update contributing rules and PR management (#4881) 2023-07-24 00:58:56 +03:00
README.md [README] Remove underscores between badges (#6896) 2024-05-17 15:34:16 +03:00
toolchain-clang.cmake [CMAKE] toolchain-clang.cmake: Use overrides-gcc.cmake 2021-12-28 01:56:33 +03:00
toolchain-gcc.cmake [CMAKE] Search the PATH for the compilers and cache the results 2022-05-25 16:34:16 +03:00
toolchain-msvc.cmake [CMAKE] Fixes for clang-cl build 2021-09-14 17:58:23 +03:00


ReactOS 0.4.14 Release Download ReactOS SourceForge Download License Donate Follow on Twitter

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What is ReactOS?

ReactOS™ is an Open Source effort to develop a quality operating system that is compatible with applications and drivers written for the Microsoft® Windows™ NT family of operating systems (NT4, 2000, XP, 2003, Vista, 7).

The ReactOS project, although currently focused on Windows Server 2003 compatibility, is always keeping an eye toward compatibility with Windows Vista and future Windows NT releases.

The code of ReactOS is licensed under GNU GPL 2.0.

Product quality warning

ReactOS is currently an Alpha quality operating system. This means that ReactOS is under heavy development and you have to be ready to encounter some problems. Different things may not work well and it can corrupt the data present on your hard disk. It is HIGHLY recommended to test ReactOS on a virtual machine or on a computer with no sensitive or critical data!


Build rosbewin.badge rosbeunix.badge coverity.badge

To build the system it is strongly advised to use the ReactOS Build Environment (RosBE). Up-to-date versions for Windows and for Unix/GNU-Linux are available from our download page at: "Build Environment".

Alternatively one can use Microsoft Visual C++ (MSVC) version 2019+. Building with MSVC is covered here: "Visual Studio or Microsoft Visual C++".

See "Building ReactOS" article for more details.


To build ReactOS you must run the configure script in the directory you want to have your build files. Choose configure.cmd or configure.sh depending on your system. Then run ninja <modulename> to build a module you want or just ninja to build all modules.

Bootable images

To build a bootable CD image run ninja bootcd from the build directory. This will create a CD image with a filename bootcd.iso.

You can always download fresh binary builds of bootable images from the "Daily builds" page.


By default, ReactOS currently can only be installed on a machine that has a FAT16 or FAT32 partition as the active (bootable) partition. The partition on which ReactOS is to be installed (which may or may not be the bootable partition) must also be formatted as FAT16 or FAT32. ReactOS Setup can format the partitions if needed.

Starting with 0.4.10, ReactOS can be installed using the BtrFS file system. But consider this as an experimental feature and thus regressions not triggered on FAT setup may be observed.

To install ReactOS from the bootable CD distribution, extract the archive contents. Then burn the CD image, boot from it, and follow the instructions.

See "Installing ReactOS" Wiki page or INSTALL for more details.


If you discover a bug in ReactOS search on JIRA first - it might be reported already. If not report the bug providing logs and as much information as possible.

See "File Bugs" for a guide.

NOTE: The bug tracker is not for discussions. Please use our official chat or our forum.

Contributing prwelcome.badge

We are always looking for developers! Check how to contribute if you are willing to participate.

Legal notice: If you have seen proprietary Microsoft Windows source code (including but not limited to the leaked Windows NT 3.5, NT 4, 2000 source code and the Windows Research Kernel), your contribution won't be accepted because of potential copyright violation.

Try out cloud-based ReactOS development using Gitpod and Docker:

Open in Gitpod

You can also support ReactOS by donating! We rely on our backers to maintain our servers and accelerate development by hiring full-time devs.

More information

ReactOS is a Free and Open Source operating system based on the Windows architecture, providing support for existing applications and drivers, and an alternative to the current dominant consumer operating system.

It is not another wrapper built on Linux, like WINE. It does not attempt or plan to compete with WINE; in fact, the user-mode part of ReactOS is almost entirely WINE-based and our two teams have cooperated closely in the past.

ReactOS is also not "yet another OS". It does not attempt to be a third player like any other alternative OS out there. People are not meant to uninstall Linux and use ReactOS instead; ReactOS is a replacement for Windows users who want a Windows replacement that behaves just like Windows.

More information is available at: reactos.org.

Also see the media/doc subdirectory for some sparse notes.

Who is responsible

Active devs are listed as members of GitHub organization. See also the CREDITS file for others.

Code mirrors

The main development is done on GitHub. We have an alternative mirror in case GitHub is down.

There is also an obsolete SVN archive repository that is kept for historical purposes.