Oops, I made the mistake of trying to clean out my program files. I had a codec program called SAF which I didn't know what it was, and was not able to find out, except I discovered it was associated with MediaPortal which I had uninstalled over a year
ago. After uninstalling SAF my WMP no longer played my .wtv files - it tries to play them, but looks like it can't decrypt the video. I found SAF again and reinstalled it, which required rebooting. However, WMP still can't decrypt the .wtv files. Does anyone
have the solution to my problem? I have Win 8.1 Pro.