CleanDrop or other extension that replaces "%20" in filenames

[DM837945]

Hello

I am looking for an extension that replaces automatically all the "." "_" "%20" with a space in the filename at download, so I don't have to always replace them by myself. (Seriously it's so annoying to always have to do that!)

It seems that such an extension existed at some point: CleanDrop, but I can't find it anywhere. Anybody has a copy?
Or is there another one?

Thanks