Microsoft KB Archive/101270

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Disabling the POSIX Subsystem

Article ID: 101270

Article Last Modified on 2/20/2007


  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Server 3.5
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Workstation 3.5
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Workstation 4.0 Developer Edition

This article was previously published under Q101270


There is little to gain by disabling the POSIX subsystem in Windows NT because POSIX is only started once a POSIX-based application is started. There are no memory savings or performance increases.


If you want to disable the POSIX subsystem, you can do so by going to the following subkey and deleting the POSIX value:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Subsystems

NOTE: The same is true for the OS/2 subsystem; until an OS/2-based application is started, the OS/2 subsystem server is not loaded.

Additional query words: prodnt

Keywords: kb3rdparty KB101270