So I've just downloaded torrent with one file in it - the formal name of file should be "123.avi.exe" (which is typical for viruses and trojans). Now, interesting thing is that name is encoded in UTF16-LE as following bytes:
FFFE3100320033002E002D202E202D202E206900760061002E00650078006500
which gives us strange, partially reversed over ".exe" text (try to move cursor left-to-right and you will be surprised):
123.iva.exe
But the bad part of all - is that utorrent showing non-suspicious ".avi" extension while when you double click it in GUI - it goes as as ".exe" and program runs.
You can test it yourself by creating dummy file with the name I wrote above. One more interesting thing - Total Commander prevents executing such file if it's name contains these special characters.
P.S. I've started similar thread on uTorrent tracker (not yet approved by moderator)