WVC 1 is a media codec that allows for playing of many media files using Windows Media Player. There are times when you try to play an audio or video file with WMP but it says that it is unable to play the file flashing an error message that an important codec is missing. You cannot hope to play media files that have been encoded using VC 1 codec unless you have this codec installed in your computer. You can either upgrade your Windows Media Player or download WVC 1 codec to be able to play those media files. Get WVC 1 codec here.