stub file missing full MS-DOS header; rebuild stub with /KNOWEAS 16-bit LINK option
The MS-DOS application specified with the /STUB option does not have a full 40-byte header. The stub program may not run as expected.
To rebuild the 16-bit stub with a full 40-byte header, use the undocumented /KNOWEAS option with the 16-bit LINK version 5.5x or higher.