Microsoft KWAJ installation compression

Unknown

archive

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.

Identify it

MIME typesapplication/x-ms-compress-kwaj
Signatures
4b57414a88f027d1 at byte 0 (File Formats Wiki)
4b57414a88f027 at byte 0
PRONOMfmt/469
WikidataQ105850885

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Open it

No software is recorded for this format.

Convert it

No conversion recorded. One of the tools above may export it; search for a chain.

0

Sources

From Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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