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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.
CSRSS.EXE - Main component of Win32 subsystem. KERNEL32.DLL - * GDI32.DLL - * USER32.DLL - * * These files are 32-bit equivalents of the similarly-named Windows files.
PSXSS.EXE - Main component of POSIX subsystem. PSXDLL.DLL - Handles communication between applications and PSXSS.EXE. POSIX.EXE - Handles communications between POSIX and the Windows NT executive.
OS2SS.EXE - Main component of OS/2 subsystem. OS2DLL.DLL - Handles communication between OS/2 application and subsystem. 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.
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