I thnik the best solution is to go back to your latest backup, or re-install MS-DOS and all your programs. That will get rid of all malware that might be present (yes, there were viruses back then).
Kees
I own a IBM PC 5160 with a 8088 processor and MS DoS 1.14, with a lot of programs, and MCA graphics. and i have installed a ms dos antirvirus to get rid of malware, but somewhat it just turned all my files into junk:
E;cE37;ec;29E (...) E929;1
Its my antivirus a malware$!?$!?!*?#!$?#?#!#!?

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