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This text was copied from the File Formats Encyclopaedia.
-- mhi
------------------------------------------------------------------------
Microsoft ships its files compressed with COMPRESS.EXE, for expansion
the program EXPAND.EXE (how original ;) ) is used. The program
EXPAND.EXE is available with every copy of MS-DOS 5.0+, the program
COMPRESS.EXE is available with several development kits, I found it with
Borland Pascal 7.0. The compression seems to be some kind of
LZ-Compression, as the fully compatible? LZCopy command under Windows
can decompress the same files. This compression feature seems to be
available on all DOS-PCs.
OFFSET Count TYPE Description
0000h 4 char ID='SZDD'
0004h 1 long reserved, always 3327F088h ?
0008h 1 byte reserved
0009h 1 char Last char of filename if file was compressed
into "FILENAME.EX_".
000Ah 1 long Original file size
------------------------------------------------------------------------
At least with the version 6.22 of MS-DOS, Microsoft changed their
compression program to a new signature; The program seems no more to be
able to restore files to their original name, if it is not given on the
command line.
OFFSET Count TYPE Description
0000h 4 char ID="KWAJ"
0004h 1 long reserved, always 0D127F088h ?
0008h 1 long reserved, always 00120003h ?
000Ch 1 word reserved, always 01 ?
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