Missing ReactOS Functionality

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This page contains a list of APIs, COM interfaces, drivers, application, extensions or other functionality that Windows has but ReactOS does not. There are other similar pages in this wiki that might help, e.g. Version Status and Roadmap. This page is intended as a list of general tasks that need to be done in ReactOS. If a certain component already exists, consider filing a bug report.

Statuses: planned, implementation started, implementation finished.


  • Boot from non-primary/logical/secondary partition; Boot from some primary partitions
  • Automatic Updates
  • Search [1]
  • User Login
  • WMI [2]
  • Diskpart [3] (command line partitioning tool)
  • Disk Defragmenter (ROSAPPS-332) [4]
  • Use Event Tracing [5] (turn debug channels into event channels??)
  • Hibernation support
  • LSASS [6]
  • Multi user support
  • Multi session support
  • Fast User Switching
  • LDAP/ActiveDirectory [7]
  • Task Scheduler
  • Printing
  • HTML Applications [8] – HTML files with a .hta extension that run as Windows Applications using the MSHTML (IE) Engine – see CORE-12813
  • Animated Mouse Cursors (CORE-14166)
  • Security Support Provider Interface (and the MS provided default packages) [9]
  • NTFS
  • WOWEXEC to run older Windows applications, based on 16 bit code. (A partial implementation of NTVDM exists. Aside: There are no "free" compilers for 16bit Windows NE style code as of 2018).

Win32 features

Introduced in Windows NT

  • NT-based CHKDSK [13]
  • Dr. Watson [i]

Introduced in Windows 98

  • System File Checker [14] (nice, but not absolutely needed)

Introduced in Windows ME

Introduced in Windows 2000

Introduced in Windows XP

  • Image Mastering API (needed for many cd writing applications)
  • Window ghosting(A window manager feature that lets the user minimize, move, or close the main window of an application that is not responding) – see CORE-11944
  • Error Reporting [19] (Would be tremendously helpful to development) (CORE-8269)
  • MUI Support [20] (An alternative is worked on by Stefan Fulea- see CORE-10335)
  • Application Compatibility [21] [i]
  • Prefetching [22]
  • Background Intelligent Transfer Service (BITS) [23] (optional, stuff that would be nice to have)
  • VirtualWiFi architecture [24]

Introduced in Windows XP x64, Windows Server 2003

  • Data Execution Prevention (DEP) [25]
  • Kernel Patch Protection (KPP) [26]

Introduced in Windows Vista

  • User Interface Privilege Isolation (UIPI) see: ChangeWindowMessageFilter
  • User Account Control (UAC) [27]
  • Address Space Layout Randomization (ASLR) [28]
  • Condition Variables (CORE-7546) [29]
  • One Time Initialization [30]
  • ThreadPool API [31]
  • Wait Chain Traversal [32]
  • Kernel Transaction Manager [33]
  • Desktop Window Manager [34]
  • Windows Search [35]
  • Windows Diagnostics Infrastructure (WDI) [36]
  • Windows Display Driver Model [37]

Introduced in Windows 7

  • New API Functions [i] [38]
  • Jump Lists [39]
  • Pin to Taskbar [40]
  • Window Snapping [41]
  • Wallpaper Rotation [42]
  • Multi-touch Support [43] (optional)
  • exFAT (Extended File Allocation Table) [44]
  • DPI settings are per-user [45]
  • Wireless Hosted Network [46]

Introduced in Windows 8

  • Supervisor Mode Execution Prevention [47]
  • Windows To Go [48] (ReactOS has LiveCDs instead)

Introduced in Windows 10

  • APPX packaging for desktop apps


Multiple processors are not supported at this time. Even if the PC has multiple processors or multiple cores, ReactOS will use only one core.

However, ReactOS can perform multiprocessing to allow many processes (programs) to run concurrently.




  • Internet Protocol Version 6 [53]
  • DHCP Server
  • SMB Filesystem Server/Client [54]
  • NFS Server/Client [55]
  • Tunnel (P-t-P) Network Communication

Low Priority Framework implementations

  • MFC and Visual C support runtimes...
  • Visual Basic Runtime
  • .NET alternative such as Mono
  • Windows Runtime