QuickTime Player Document won't open

I tried opening it a few times and checked permissions, (I think they're set right) and QuickTime won't open my QuickTime Player Documents. The end part is .ml20.
Any advice?

"checked permissions, (I think they're set right) "
Do you actually mean you checked your QT MIME settings? Asking because you really don't check permissions to set anything.
Repairing permissions involes the following:
Save and/or quit your applications & doucuments
Go to Applications>Utilities Folder
Click Disk Utility
Click the Volumn (HD) that you want to check.
Click the Repair Disk Permissions button. (Don't worry about verifying)
At the bottom of window when the repairs have finished, you will see the “most important thing”:
Permission Repairs Complete
The previliges have been repaired or completed on the selected volumn.
Restart your computer.

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