Nullsoft streaming video file that comes with Winamp
NSV is a file extension for a streaming video container format created by Nullsoft. NSV stands for NullSoft Video. NSV files can contain compressed streaming video, multiple audio tracks, subtitles, and other data. NSV files can be opened by WinAMP.
MIME type: application/x-winamp
Learn more about .NSV files:
Jessica Scarpati discusses enterprise video streaming tools.
Visit the NullSoft web page.
Read about video compression standards at ITKnowledgeExchange.com.