.!UT File Extension
uTorrent Incomplete Download
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What is a !UT file?
Partial torrent file downloaded with the uTorrent BitTorrent client; appended to all in-progress downloads if the "Append '.!ut' to incomplete files" option is selected in uTorrent preferences; the ".!ut" extension is removed once the file has been fully downloaded.
Incomplete torrents downloaded with uTorrent can be resumed by uTorrent if the same file is available on an active server.