Quick guide
About WMV and MP3 files
WMV - Windows Media Video
WMV is a Microsoft video format used by some Windows software and older video libraries. Converting WMV helps make those files easier to use in current browsers and apps.
MP3 - MPEG-1 Audio Layer III
MP3 is a compact audio format that works almost everywhere. It is a good choice when you want a small file for music, voice recordings, podcasts, or sharing audio online.