You don't but I do: you don't want to replace all your exec of e.g. "cp" with "cp.exe", .exe are not very often handled in real Unix environments, results of bu

You don't but I do: you don't want to replace all your exec of e.g. "cp" with "cp.exe", .exe are not very often handled in real Unix environments, results of build without .exe under a real Unix would already clash with a .exe-less entry, Cygwin/MSys/MSys2 are there mainly for compat, and in this context the most compat you achieve (both way) is to handle .exe the way they do -- and there should be no exception. This leads to odd behaviors, which is unfortunate, but alternatives would lead to even more and/or worse ones.