A free Windows-compatible Operating System
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Katayama Hirofumi MZ 9455defbd3 [IMM32] Remove old code of Imm32StrToUInt and Imm32UIntToStr 3 hours ago
.github [GITHUB] build.yml: Update LLVM version to 13 (#4054) 15 hours ago
.theia [GITPOD]Add gitpod config 2 years ago
base [EXPLORER] Send WM_POPUPSYSTEMMENU asynchronously (#4047) 4 days ago
boot [TRANSLATION] Update Turkish (tr-TR) translations (#3958) 2 weeks ago
dll [IMM32] Remove old code of Imm32StrToUInt and Imm32UIntToStr 3 hours ago
drivers [ISAPNP] Generate a name for PDO, as required 1 week ago
hal [CMAKE] Replace custom scripts in compilerflags with standard ones 1 month ago
media [TRANSLATION] Update Turkish (tr-TR) translations (#3958) 2 weeks ago
modules [IMM32_APITEST] Fix himc testcase crash (#4036) 3 days ago
ntoskrnl [NTOS:PNP] Fix crash when removing a device without resources 4 days ago
sdk [SDK] Allow ARM64 MSVC to complete configuration (#4045) 14 hours ago
subsystems [FORMATTING] Remove trailing whitespace. Addendum to 34593d93. 1 month ago
win32ss [WIN32SS:NTUSER] Make sure to hold User Global Lock before manipulating desktops. (#4053) 10 hours ago
.clang-format [REACTOS] Introduce .clang-format file 2 years ago
.editorconfig Remove the 'end_of_line' value. Addendum to 32db19f6 - PR #2528 2 years ago
.gitattributes Fix remaining text file line endings in the tree. (#18) 4 years ago
.gitignore [GITIGNORE] Add compile_commands.json and .cache folder for clangd cache 4 months ago
.gitmessage [FORMATTING] Remove trailing whitespace. Addendum to 34593d93. 1 month ago
.gitpod.Dockerfile [FORMATTING] Remove trailing whitespace. Addendum to 34593d93. 1 month ago
.gitpod.yml [GITPOD]Add gitpod config 2 years ago
CMakeLists.txt [SDK] Allow ARM64 MSVC to complete configuration (#4045) 14 hours ago
CODEOWNERS [FFS] Remove the FFS/UFS driver 3 months ago
CODE_OF_CONDUCT.md Add a document on the rules we should follow while managing/reviewing PRs, 3 years ago
CONTRIBUTING.md [REACTOS] Remove some ending spaces 2 years ago
COPYING Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys. 4 years ago
COPYING.ARM [FORMATTING] Remove trailing whitespace. Addendum to 34593d93. 1 month ago
COPYING.LIB Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys. 4 years ago
COPYING3 Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys. 4 years ago
COPYING3.LIB Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys. 4 years ago
CREDITS [CREDITS] Add myself to the credits document (#2747) 1 year ago
Doxyfile [DOXYGEN] Update Doxyfile for our build of Doxygen 1.8.15. 3 years ago
INSTALL [REACTOS] Remove some ending spaces 2 years ago
PULL_REQUEST_MANAGEMENT.md Add a document on the rules we should follow while managing/reviewing PRs, 3 years ago
PreLoad.cmake Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys. 4 years ago
README.md [README] Trivial correction: replace "Seven" with "7" (#3469) 8 months ago
apistatus.lst Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys. 4 years ago
configure.cmd [CONFIGURE][CMAKE] Add support for MSVC ARM64 target 7 days ago
configure.sh [CONFIGURE] Make configure.sh print out an error when CMake fails 3 months ago
overrides-gcc.cmake [CMAKE] Clear CMAKE_<LANGUAGE>_IMPLICIT_LINK_LIBRARIES and 3 years ago
overrides-msvc.cmake CORE-14513 [CMAKE] Remove modules that are shipped with cmake (#575) 3 years ago
toolchain-clang.cmake [CMAKE] Require ARCH variable to be specified explicitly 6 months ago
toolchain-gcc.cmake [CMAKE] Cache compiler paths to make some utilities happy 4 months ago
toolchain-msvc.cmake [CMAKE] Fixes for clang-cl build 1 month ago

README.md

ReactOS


ReactOS 0.4.13 Release Download ReactOS SourceForge Download License Donate Follow on Twitter

WebsiteOfficial chatWikiForumJIRA Bug TrackerReactOS Git mirrorTestman

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!

Building

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 2015+. Building with MSVC is covered here: "Visual Studio or Microsoft Visual C++".

See "Building ReactOS" article for more details.

Binaries

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.

Installing

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.

Testing

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.