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I have a security video records on my computer. And try to play them, I almost tried all possible alternative players. The file extensions are exp and h264, some errors I have received could not render file or shn error..

Could you please suggest a possible solution?

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you might want to mention explicitly what players you've tried and which version of windows, and running something like gspot to get information on what exactly the codec is. – Journeyman Geek Sep 6 '11 at 23:09
What players have you tried? – MaQleod Sep 6 '11 at 23:10
What were they recorded with? – Ƭᴇcʜιᴇ007 Sep 7 '11 at 3:38

I'd recommend trying VLC.

VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVD, Audio CD, VCD, and various streaming protocols.

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