TSFs, or T_scfe Support Files, are T_SCFE support extensions. That is, TSFs allow T_SCFE to process skins it normally couldn't. The TSF file format is one line, as follows:

description*palette*filename


The different values are separated by asterisks. The following is a working example which would add support for the disc launcher to T_SCFE.):

Disc Launcher*pal2*disc.bmp


Since the asterisks are used in TSFs as separators, you can't use them anywhere else in the file.