I purchased a movie from Google Play, then used Ant Video Player to download it. It's in MP4 format (or, at least, has an MP4 extension). When I try to open it in Windows Media Player, I get the error
Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file.
Error -2041: an invalid sample description was found in the movie (filename.mp4)
I've Googled error 2041, and the suggested workaround in various forums was to change the filename extension to .3gp. That didn't work either. Windows Media Player gave a similar error, and Quicktime said
Error -8971: an unknown error occurred (filename.3gp)
How do I get to play the file in Windows 8.1?