From Just Solve the File Format Problem
TSComp is the informal name of a compressed archive format used by some versions of the InstallShield installation software by The Stirling Group. It is also supported by a DOS utility named The Stirling Compressor. It uses PKWARE DCL Implode compression.
For single-file archives, often the last letter of the filename extension is changed to "$". For multi-file archives, the most common extensions seem to be .lib and .cmp.
Files begin with bytes:
65 5D 13 8C 08 01.
- The Stirling Compressor v1.3.21
- untsc A command line extractor with source in Golang.