COMPACK

File Format
Name	COMPACK
Ontology	Electronic File Formats Compression Executable compression COMPACK
Released	1990?

For a similarly-named format, see COM-Pack library‎.

COMPACK is an executable compression utility for DOS. It was developed by W. J. Collis and Prominence Computer Services, and distributed as shareware. It compresses EXE and COM files.

It also includes a utility named BUILDSFX (integrated into COMPACK.EXE in v5.1), which creates self-extracting archives.

Identification

COMPACK-compressed EXE files most likely have the ASCII string "W Collis" at offset 100 (as part of a copyright notice).

COMPACK-compressed COM files most likely have the ASCII string "W Collis" at offset 60.

Software

• COMPACK v4.5 (1991-11-14?)
  • cpk45.zip → CPK45.EXE
  • CPK45.ZIP (pre-installed)
• COMPACK v5.1 (1993)