Files with the extension .!UT indicate incomplete files downloaded using 'UTorrent'. UTorrent is described as a lightweight, feature rich 'Bit torrent' client.
Bit Torrent is a 'P2P' file sharing system (peer-to-peer) communications protocol, Bit Torrent systems essentially allow users to share files (most commonly audio/movies/games) via the internet, small amounts of data are sent via large groups of users to new users, reducing the resources needed for sharing files individually.
'!UT' extensions are usually seen as a 'double-extension' i.e. the '.!UT' follows after another extension, e.g. data.avi.!UT
Usually the .!UT part of the extension will be removed automatically when the file has downloaded completely.
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