[nick_at_seakr]

See the part in the original post about how "gunzip" works to uncompress the archive - since this is the case, I'm fairly sure that the file is actually a .tar.gz file. Also, after I uncompress the file, I can recompress with gzip (gzip </path/to/archive>) and then try to run "tar tzf <archive>" or "zcat <archive>|tar tf -" and I get the same error messages.

Thanks for the response!
-Nick