Application "Library" damaged or incomplete

Whenever i try to open a video on a memory stick I get the error message my Library may be damaged or incomplete. It works fine on other computers. It also wont play direct from my iTunes folder on my external drive.
Thanks anyone??

Hello Brian,
Thank you for the details of the issue you are experiencing with opening .mp4 files from the Finder.  It sounds like you may need to set iTunes (or an alternate application that plays .mp4 files) as the default application to open .mp4 files on your computer. 
Use these steps:
To always open a document with a specific application:
In the Finder, select the document’s icon and choose File > Get Info.
In the Info window, click the disclosure triangle next to “Open with.”
Choose the application you want to use from the pop-up menu.
If you want all documents of this file type to open with the same application, click Change All.
In step 3, be sure to select iTunes (or an alternate application that plays .mp4 files) from the Applications folder on your computer.
Mac OS X 10.6: If a document doesn’t open with the right application
http://support.apple.com/kb/PH6767
Thank you for using Apple Support Communities.
Best,
Sheila M.

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