Unfortunately that patch will not help for files like "python.exe.exe", and double ext which sometimes happens.
I'm on it. Should take me a day or two, more problems might arise along the way. Thanks Bob for alerting.

Regarding the uppercase, I believe it is better to leave the casing as it is. It should be up to the user to mess with it as converting case is a one way ticket. If someone entered an uppercase, perhaps he wants it like that. Also it's less prune to errors and behaves the same for Unix and Windows.