Details: File format summary

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Summary
Name	MS DOS Compression Format (KWAJ Variant)
Version
Other names
Identifiers	PUID: fmt/469
Family
Classification
Disclosure
Description	The MS-DOS compression format uses the LZSS algorithm to compress a single file into another single file, replacing the last character in the filename with an underscore. It is implemented via the MS-DOS commands COMPRESS.EXE and EXPAND.EXE.
Orientation
Byte order
Related file formats	None.
Technical Environment
Released
Supported until
Format Risk
Developed by	None.
Supported by	None.
Source	Digital Preservation Department / The National Archives
Source date	25 Oct 2012
Source description
Last updated	04 Mar 2022
Note	A DOS compressed file will be named file.**_, so a .exe will look like file.ex_, a DOS compressed .jpg will look like file.jp_ etc. https://www.cabextract.org.uk/libmspack/doc/szdd_kwaj_format.html