On: Project: 2ine – OS/2 emulator for Linux

[einr]

Sadly, Microsoft used these dirty trick that Windows 3.1 would autofail if detect any OS that isn't MS-DOS.

That code, while present in the codebase, was deactivated in the release version of Windows 3.1, so it actually ran just fine on DR-DOS.

[stuaxo → einr]

Windows 95 had something similar, the ARD code.

[geocar → stuaxo]

https://en.wikipedia.org/wiki/AARD_code