There is only one file type that uses the .TOR extension:
Star Wars: The Old Republic Asset File
Archive used by Star Wars: The Old Republic (SWTOR); contains game data, such as maps, characters, weapons, and music; saved in the MYP archive format.
TOR files are stored by default in the /Assets folder within the SWTOR installation directory. While they are not meant to be edited manually, the contents of a TOR file can be extracted using a utility like EasyMYP.
Updated: February 13, 2012