Notes about the WTMP file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The WTMP file type is primarily associated with 'Partial Torrent Download'. FILExt has no specific information on this file type however searches bring it up most often in discussions of partial downloads from an unnamed Torrent client. The TMP part would seem to indicate this is a temporary file not designed to be opened until the download is complete.