I have a .wmv file I uploaded to my website. When I click the link to the video, the video plays in Windows Media Player without any problems. However, on some systems when the user clicks the link, Windows Media Player gives them the error:

Window 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

All I did was copy the video to the server and store the URL in a database. Why are users getting this error? How can I fix it?