All of a sudden I can not play videos that are sent to me, I had no trouble playing them with quicktime before, what can I do?

I have had this iMac for 5 years and have had zero problems with it , I run the lastest software (not mountain Lion) and all of a sudden I can not play downloaded videos that have been sent to me. What can I do ?

Either launch VLC (assuming you have installed it) and then open the file you want to view from within VLC, or, select the file (don't open) you want to view and do Command+I and from the window that appears select VLC from the 'Open with:' option.
You can make this the default if you wish by also clicking on the 'change all' button.

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