Microsoft KB Archive/105992

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Article ID: 105992

Article Last Modified on 10/31/2006


  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Advanced Server 3.1

This article was previously published under Q105992


The following information describes the files associated with each subsystem in Windows NT and the files associated with the virtual MS-DOS machine (VDM) and the Windows on Windows (WOW) environment.

WIN32 Subsystem

CSRSS.EXE    - Main component of Win32 subsystem.
GDI32.DLL    - *
USER32.DLL   - *

 * These files are 32-bit equivalents of the similarly-named Windows

POSIX Subsystem

PSXSS.EXE    - Main component of POSIX subsystem.
PSXDLL.DLL   - Handles communication between applications and
POSIX.EXE    - Handles communications between POSIX and the Windows NT

OS/2 Subsystem

OS2SS.EXE    - Main component of OS/2 subsystem.
OS2DLL.DLL   - Handles communication between OS/2 application and
OS2.EXE      - Passes name and command line parameters to OS2SVR.EXE.
OS2SRV.EXE   - Component that starts the application for the subsystem.

MS-DOS Virtual DOS Machine (VDM)

NTIO.SYS     - The equivalent of IO.SYS on MS-DOS machines.
NTDOS.SYS    - The equivalent of MSDOS.SYS.
NTVDM.EXE    - Win32 Application.
NTVDM.DLL    - Win32 Application.
REDIR.EXE    - Virtual Device Driver (VDD) redirector for the VDM.

Window on Windows (WOW)

WOWEXEC.EXE  - Handles the loading of 16-bit Windows-based applications.
WOW32.DLL    - Dynamic Link Library of the WOW application environment.
NTVDM.EXE    - VDM Component.
NTVDM.DLL    - VDM Component.
NTIO.SYS     - VDM Component.
REDIR.EXE    - VDM Component.
VDMREDIR.DLL - Redirector for WOW environment.
KRNL386.EXE  - Used by WOW on x86 based systems.
KRNL286.EXE  - Used by WOW on non x86 based systems.
GDI.EXE      - Modified version of Windows 3.10 GDI.EXE.
USER.EXE     - Modified version of Windows 3.10 USER.EXE.

Additional query words: prodnt

Keywords: kbother KB105992