[seritools]

According to https://en.wikipedia.org/wiki/Microsoft_Visual_C%2B%2B#Histo..., the last version to support Win3.1 is VC++ 1.52 (which was shipped with VC++ up to version 4).

Unless you mean NT3.1 of course :^)

[dmitrygr]

I sit corrected. use VS4, also from archive.org, same serial. produced binaries will also work on win11