.plt files are mime encoded gziped tars AFAIK.
".plt" files are base64'd and gzip'd, but I think that's not a
conventional tar format they're using. (For another implementation of
reading ".plt" files, you can see function "quack-pltfile-decode-buffer"
in Quack.)
For picking apart a tarball, the options I see are:
* Call a C library using the FFI.
* Call the "tar" program.
* Code up a "tar" format reader in Racket.
Caution: When untarring to a filesystem, you have to be careful that you
don't overwrite files you don't mean to. You also have to check for
security exploits that go up the directory tree to write files, or that
write so-called 'special' files, or files with other (privileged) owner
or special permissions.
--
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