XPACK
XPACK is a multi-function compression utility for DOS, probably best known for its executable compression. It was developed by JauMing Tseng. Some versions were distributed as freeware, others as shareware.
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Disambiguation
- XPACK is not the same as X-pack for Executable (XE.EXE).
- DOS XPACK is not the same as the XPA/XPA32/XPAGUI/"XPACK-archiver for Win32" programs by the same author. More research is needed to understand the relationships of these things.
- There is an unrelated collection of DOS utilities also named XPACK: XPACK.ZIP
Format details
XPACK does executable compression of .EXE and .COM files.
It supports single-file compression of arbitrary data files, and has a TSR utility to do transparent decompression. Such files are presumably expected to retain their original filename.
It has an .XPA compressed archive format.
It has an .XDI compressed floppy disk image format.
Identification
At least some compressed EXE files have "xpac" at offset 28.
Compressed data files apparently start with bytes cd 20 6a 6d.
.xpa archives start with 'x' 'p' 'a' 0x18, followed by 11 0x00 bytes.
.xdi disk images possibly start with 'j' 'm' 0x02 0x04.
Software
- XPACK v1.67.m
- XPACK 1.34
- ANORMAL's DOSEXE collections → Executable Tools Pack → packers/x-pack.167*
