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The Quantum compression format is a little-known data compression method created by David Stafford of Cinematronics, LLC. Rights to it were purchased by Microsoft, and Quantum is one of the possible compression methods in a CAB archive[1]. Quantum uses an extended LZ compression algorithm. Contents 1 Quantum (.Q) archiver 2 .Q archive header 3 References 4 External links Quantum (.Q) archiver PAQ.EXE is the Quantum compressor for MS-DOS. No Windows compressor is known to exist. UNPAQ.EXE is the decompressor for MS-DOS and QWIN.EXE is the Windows decompressor. The Windows decompressor is much faster and has more features than the MS-DOS decompressor, such as selective decompression. Each requires at least a 386 CPU in order to run. The last known version is 0.97. .Q archive header Bytes Description 2 signature, must be 0x44 followed by 0x53 1 major version number 1 minor version number 2 number of files which reside in this archive 1 table size required for decompression 1 compression flags This is immediately followed by the list of files: Bytes Description var. length of file name, see (*) below var. file name, variable length string, not zero-terminated var. length of comment field, see (*) below var. comment field, variable length string, not zero-terminated 4 fully expanded file size in bytes 2 file time (DOS format) 2 file date (DOS format) Immediately following the list of files is the compressed data. (*) Strings are prefixed with their length. This takes one or two bytes. If the length is less than 128 then it is stored directly in one byte. If it is greater than 127 then the high bit of the first byte is set to 1 and the remaining fifteen bits contain the actual length in big-endian format. References ^ http://www.cabextract.org.uk/ History of CAB files format Salomon, David (2007). Data compression: the complete reference. Springer Verlag. pp. 187. ISBN 1-84628-602-6.  External links http://russotto.net/quantumcomp.html ftp://ftp.sac.sk/pub/sac/pack/quant097.zip This computing article is a stub. You can help Wikipedia by expanding it.v · d · e