.!QB File Extension
qBittorrent Partial Download File
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What is a !QB file?
A !QB file is an incomplete download file created by qBittorrent, a Torrent client. qBittorrent appends the ".!qB" extension to a file as it is being downloaded. The extension is removed when the download is complete. !QB files are similar to .!BT BitTorrent and .!UT uTorrent files.
NOTE: The !QB extension is used only if you check the "Append .!qB extension to incomplete files" option in the Downloads settings (Tools → Options and then select Downloads). The option is unchecked by default.