I just upgraded to Windows 7 and now I can't get the Windows Media Player 12 to play .mov files. It will play some old ones but not the new ones. I even tried to play with Quicktime and no good.
Also I would suggest you to check whether media player has set all the files as default. To do so, please follow the steps below:
1.Open Default Programs by clicking the
Start button,
and then clicking Default Programs.
2.Click
Set your default programs.
3.In the
Programs list, click Windows Media Player, and then click
Choose defaults for this program.
4.Click on select all check box on top left corner or you can select the check boxes next to the file types that you want
Windows Media Player to play by default.
If you don't want
Windows Media Player to play a particular file type by default, go back to Set your default programs and choose a different program to be the default player for that file type.
For more information, please follow the links mentioned below: