ml611d.exe      Q138983 PATCH: MASM 6.11d Patch Available       Updates a MASM version 6.11 or 6.11a installation to version 6.11d.

Due to changes in the MS-DOS extender used in earlier versions of MASM, MASM 6.14 does not run on Windows 3.1x or MS-DOS. Either Windows NT or Windows 95 is required to run MASM 6.14. If you are working in MS-DOS or Windows 3.1x, you need to continue using version 6.11d. 