tmp.. its a temporary file. Found the below from a quick google search of tmp file:
"Temporary files are used for a wide variety of tasks. They are usually deleted after their purpose is served but circumstances sometimes cause them to be retained. It's tricky determining if you can delete the file or not since some programs may hide critical data within a .TMP file (not a good programming practice if you're a programmer reading this!)."
Basicly it is hard to tell where the file came from. I would delete it, but leave it in your recycle bin for a few days to make sure it isnt a needed tmp file. Chanaces are it isn't, but its better to be safe.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS