detect unwanted file uploads

Hi, I have the problem that often users upload unwanted files (e.g. videos, mp3 etc.) to their free hosting accounts and hotlink to them which makes my traffic increase. What I need is a software which could read the file and detect the file type. If it were an archive, then it would extract the archive and search through the files in it to detect their filetype. So, the upload formular could look like for example here: