Logged In: YES 
user_id=315964

I would contend that UNIX file permissions are not
compatible with MS-DOS though it is possible that PKZIP
2.04g might read them and convert them to an approximation.
I would hope that an unzipping program would ignore any file
type code that it did not know how to interpret.  The ZIP
spec explicitly says the the external file attributes are
set to zero in the case where input is from standard input.
I infer from that that an unzipper should at least be able
to extract the bytes of a file.

Rather than argue over fine points of interpretation I think
that we should take the pragmatic view that a ZIP archive is
most likely to be unzipped on the same type of file system
that it was created on.

The file system code is indeed more complicated.  Setting
one type for the archive is limiting.  It ought to be set
for each member.  And yes, it should be file system rather
than OS.

unzip does honor the file mode.  External file attributes
must be interpreted according to 'version made by'.  It does
have options such as '-X restore UID/GID info' but those
control how much metadata is unpacked, not override
incorrect fields.