Its just a new codec from winamp. Just go to www.winamp.com and find out more and I also recommend the VLC Player which can play any file extension without having to download many codecs. http://www.videolan.org/vlc/
Thanks, i got winamp and use that to play them just wanted toconvert some .nsv's to a .wmv to put on a dvd unless you can burn .nsv's as movie files to play as a dvd.
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That may be of help but I just did a search and I dont think you can convert NSV file to one of the popular formats. Do some research on how to convert video files.