perhaps VERSION could fix this -http://help.fdos.org/en/hhstndrd/cnfigsys/version.htm
That is very interesting, I might try it out to see if it works.
Bugger.
The program tries to verify the integrity of MSDOS.SYS and VER.EXE with some sort of weak hash, as well as get the result of VER.
FreeDOS's VERSION gets me halfway though, now just to generate some dummy files when I work out the right hashing algo to use...
Thanks for the update! What about just copying those files over from MS-DOS?
Unfortunately getting the particular program to install requires a little fudging as it tries to detect Win, and underlying DOS, and wants particular numbers to be present in the versions.