Videos that I priviously was able to see, no longer can and asks for an App.

Hi, I have many sort videos on my Iphoto which I was able to watch previously and now I get a message asking for an App. How can I fix it? Many thanks!

On MacOS X 10.8.5 has been a problem with videos in some cases, when cleaning applications cleaned a certain cache, and a helper file was missing, that may be necessary to play videos.
If you have been running cleaning applications, try the fix below:
With MacOSX Mavericks and  Mt. Lion it helped to rebuild the cache using a Terminal command:
Try this fix posted by andyBall_UK:
Open a Terminal window (the Terminal.app is in Applications > Utilities)
Copy and paste the line below into the Terminal window, hit return  and enter your administrator password.
sudo /usr/libexec/xpchelper --rebuild-cache
If you do not want to use a Terminal command you can achieve the same thing by booting into recovery and reinstalling the system on top of your current system - don't wipe the drive again. OS X: About OS X Recovery
See andyBall_uk's post:
Re: Import video to Aperture library on Mountain Lion

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