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MS-DOS installation compression - Just Solve the File Format Problem

MS-DOS installation compression

From Just Solve the File Format Problem
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File Format
Name MS-DOS installation compression
Ontology
Extension(s) .??_, .??$
PRONOM fmt/462

MS-DOS installation compression refers to a family of compressed file formats formats by Microsoft that appear on MS-DOS and early Windows (3.x) installation disks. The formats have no generally agreed-upon name. This article is primarily about the format whose files start with "SZDD". For the other formats, see Microsoft KWAJ installation compression and Microsoft SZ installation compression.

Compressed files may be generated by the COMPRESS.EXE program (appearing in Microsoft's Setup Toolkit for Visual C++), and decompressed with the EXPAND.EXE program distributed with Windows and MS-DOS. Compressed files have the last character of the file extension replaced with an underscore, or sometimes a dollar sign.

Contents

See also

Other formats in this family:

Other formats that might be in this family:

Format details

SZDD's compression format is similar, but not identical, to Okumura's LZSS. There is a byte at offset 8 that specifies the exact type of compression. Most sources say that the only known value for this byte is "A" (0x41), but some report[1] that there is also a type "B", used by Windows 3.1 builds 026 and 034e.

Identification

An SZDD file begins with bytes 53 5A 44 44 88 F0 27 33.

Software

Sample files

Links

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox

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