Replacing illegal characters in folder and file names?

[bbrip]

Well, from my experience its dots, commas, question marks, exclamation marks, quotation marks, double points, semicolons, "Umlaute" (ä,ü,ö etc..) and even spaces that might cause issues to some particulary "dumb" control point.

If you want to be sure to get it to work, you may have to avoid all of those - or dump / send back that piece of equipment until the manufacturer has fixed it, which is what I would do there must be better toys than this Roberts radio (which I've never used or heard of before) if it causes so many issues...