README_w32s.txt for version 7.4 of Vim: Vi IMproved. This archive contains the gvim.exe that was specifically compiled for use in the Win32s subsystem in MS-Windows 3.1 and 3.11. Also see the README_bindos.txt, README_dos.txt and README.txt files. Be careful not to overwrite the Win32s gvim.exe with the another gvim.exe when unpacking another binary archive! Check the output of ":version": Win32s - "MS-Windows 16/32 bit GUI version" Win32 - "MS-Windows 32 bit GUI version" Win32 with OLE - "MS-Windows 32 bit GUI version with OLE support" For further information, type this inside Vim: :help win32s