I would steer clear
by lodgrantham - 6/2/12 5:08 AM
There are reports of many malware extensions, including one called codec-c
here's a report of what happened when someone removed codec-v
https://www.facebook.com/help/community/question/?id=2213725
I would say all modern browsers and operating systems are able to play any video out there. there is almost never a reason to download a new codec

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