There are hundreds of file converters that you can use to convert any file from one format to another format. For instance, if you want to convert audio files, head over to Format Factory. If you want ...

I want to do some very basic editing of STEP files, e.g.: I need to do this sort of thing about a hundred times, so I'd rather learn how to fish than pay someone to do it, even if it's only a few $$ ...