There is only one file type that uses the .TZ extension:
Zipped Tar Archive
Unix Tar archive zipped using a basic Unix compression algorithm; combines a .TAR archive and .Z file; used for archiving collections of files on Unix-based systems.
The contents of a TZ file can be decompressed and extracted in Unix with the following command: tar -xzvf [filename].
Updated: August 16, 2008