hotlink protection & wildcards

Yes, i wold like to ask, why Hotlink prevention forgets file types that you want to prevent for hotlinking, for example, if you add exe,zip, at firs it says that among others, exes and zips are forbidden, but, when you came back, let's say to add mp3-s, in text field stas only default file types. No more my exes nor zips :-(

Is this normal, or it is some feature that i just can't understand?

gemby