Microsoft tried VERY hard to prevent various versions of windows from running on IBM PCDOS and DR-DOS, so they could boost their MSDOS sales. Just google for "AARD detection code" for some technical info.

What do you think about the possibility of integrating DOSBox with Fabrice Bellard's portable (uses gcc for code generation apparently) dynamic-translating pentum emulator? On 1ghz machines this emulator reaches convincing pentium speeds. Just a thought, I know it would be a hell of a job :) Regards …