My videos won't play on my PC because they copied over as dat files. Help!

I followed the steps on how to copy my 5G nano videos over to my PC. They copied over, however, I cannot play them in Media Plaver because the file copied over as a dat file. And when I play them on Quick Time, there's a lag between voice and video. Any suggestions????

see if they play with VLC
it might be you dont have the codec for them to play
http://www.videolan.org/
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Let us focus the following
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You wrote
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My videos won't play on my PC because they copied over as dat files. Help!

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