TGZ refers to the .tar.gz format, abbreviated .tgz by convention. On a UNIX system, use the command 'gunzip mythusXX.tgz | tar xvf' to uncompress. If the GNU utilities are all installed, the command 'tar xvfz mythusXX.tgz' will do the same.
Wayne Westphalen has done a marvelous job of condensing the logfiles, removing the irrelevant portions.