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.ZIP is an archive file format that supports lossless data compression.

File format

Characteristics Description
Byte order little-endian
Date and time values
Character strings

Archived file header

Creator version

The creator (or version made by) is 2 bytes of size and consists of:

Offset Size Value Description
0 1 ZIP format version
The value is stored as: ( major number x 10 ) + minor number
1 1 Creator version system indicator
Creator version system indicator
Value Identifier Description
0 MS-DOS and OS/2 (FAT / VFAT / FAT32 file systems) or compatible systems
1 Amiga
2 OpenVMS
5 Atari ST
6 OS/2 H.P.F.S.
7 Macintosh
8 Z-System
9 CP/M
10 Windows NTFS
11 MVS (OS/390 - Z/OS)
12 VSE
13 Acorn Risc
15 alternate MVS
16 BeOS
17 Tandem
18 OS/400
19 OS X (Darwin)
20 - 255 unused

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