LZEXE

File Format
Name	LZEXE
Ontology	Electronic File Formats Compression Executable compression LZEXE
Released	1989

LZEXE is an executable compression utility, developed by Fabrice Bellard. It compresses DOS .EXE files.

Identification

LZEXE-compressed files normally have ASCII "LZ09" or "LZ91" at offset 28.

As with most compressed executable formats, more-robust identification is possible, by looking for the characteristic decompression code.

Software

• LZEXE
  • v0.90 (1989-10-30)
  • v0.91 (1990-01-02)
  • v0.91e (1990-10-15). Alternate link: [1]

• UNLZEXE - A widely-distributed open source utility that does static decompression of LZEXE-compressed executables. Originally by Mitugu Kurizono (Kou). Versions "0.6" and above include patches by other authors, and might be unofficial.
  • v0.2 (1990-03-29)
  • v0.4 (1990-05-12)
  • v0.5 (1990-05-17)
  • v0.7
  • v0.8
  • https://github.com/mywave82/unlzexe - Modernized source code

Links

• LZEXE home page
• Reversing LZ91 from Commander Keen (This is reportedly[2] about LZEXE.)