Serhiy Storchaka added the comment:
This byte identifies the type of file system. How can you determine it? Note
that different filesystems can be used on the same OS. FAT still widely used on
Windows (and what about exFAT, should it be considered as a flavour of FAT or
separate type?), virtually any file system can be mounted on Linux.
See 2.3.1.2 in RFC 1952:
A compliant compressor must produce files with correct ID1,
ID2, CM, CRC32, and ISIZE, but may set all the other fields in
the fixed-length part of the header to default values (255 for
OS, 0 for all others).
[...] a decompressor may ignore FTEXT and OS
and always produce binary output, and still be compliant.
Since the gzip module never sets the FTEXT flag, the value of the OS field is
useless.
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nosy: +serhiy.storchaka
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