I downloaded an AVI file which worked fine in Windows media player. I then tried to rename it and I dont know what I've done. When I hover the cursor over it now says "Type: File" instead of "Type: Video Clip". Also when I double click it does not start & I get a message saying Windows cannot open the file & needs to know what program created it. I can still view the file by using an AVI video viewer but would like to know how to change it back so when I double click it opens in Windows Media Player.