You can save several different types of files for your part.
The filename of all files is the same as the part name. If you have a part called part, the files created are: part.op, part.tl, part.txt, part.tdb, part.fdb, and part.cdb. When saving the NC code you are given the opportunity to change the NC file name. If you enter a different NC file name, the default file extension is .txt. The file extension can be configured by the post-processor if the machine control requires a suffix other than .txt.
If a part has multiple setups, the Setup ID number is appended to the part name. For example, if you have a part called plate with three Setups, three different sets of files are created called plate, plate2, and plate3. So a .op, .tl, .txt, .tdb, .fdb, and .cdb file are created for each Setup for a total of eighteen files.