Microsoft POSIX subsystem

Microsoft POSIX subsystem
DeveloperMicrosoft
ReleaseJuly 27, 1993 (1993-07-27)
Operating systemMicrosoft Windows
PlatformIA-32, Alpha, MIPS, PowerPC
SuccessorWindows Services for UNIX
StandardsPOSIX.1 standard
(IEEE Std 1003.1-1990 / ISO/IEC 9945-1:1990)
TypeCompatibility layer

Microsoft POSIX subsystem is one of four subsystems shipped with the first versions of Windows NT, the other three being the Win32 subsystem which provided the primary API for Windows NT, plus the OS/2 and security subsystems.