POSITIVITY. Windows 10 Anniversary Update: Loss of music and video - Windows Help. Only the following file formats used WMDRM: Windows Media Audio (.wma) Windows Media Video (.wmv) Windows Media audio/video (.asf) So if you don’t have .wma, .wmv or .asf files, you’re probably not affected.
To see if you have these types of files, search your PC for each file extension separately (search your PC for *.wma, then search for *.wmv, and then search for *.asf). Here’s how to see if an individual file will be affected if you’re on a version of Windows prior to the Windows 10 Anniversary Update: Browse to the file. Note If you search for .wma, .wmv, and .asf files and don’t find anything, but still see the message about loss of music or video content, it means there are license files on your PC.