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(tar.info.gz) Portability
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8.3.1 Portable Names
--------------------
Use portable file and member names. A name is portable if it contains
only ASCII letters and digits, '/', '.', '_', and '-'; it cannot be
empty, start with '-' or '//', or contain '/-'. Avoid deep directory
nesting. For portability to old Unix hosts, limit your file name
components to 14 characters or less.
If you intend to have your 'tar' archives to be read under MSDOS, you
should not rely on case distinction for file names, and you might use
the GNU 'doschk' program for helping you further diagnosing illegal
MSDOS names, which are even more limited than System V's.
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