Windows 7 Codec Pack
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Full user review
"Better than Advertised"
Downloaded and installed with 2 clicks. Plenty of setup options available for those who know what they're doing, fully functional default settings for those of us who don't. .flv, .mkv, .flac, and DVD's all played right out of the box on my Windows 7 Pro x64 machine.
Haven't found any yet.
Don't tell the author but I would have been tempted to pay for this one.