WinZip doesn't work with TarGzip but I wanted to add something. As I've been handling some inquiries via AIM of late regarding this feature. For several new to the game, there's a misunderstanding that the Archive and Upload function in this part of the game is for the league file, what your league members need in order to use the game and export changes to their teams.
This is not what it is for!
It is for is compressing the HTML reports (includes standings, player pages, team pages, etc.) which is actually the game created "website".
If you own a site that supports FTP and server side extracting of archived files, this function is for you.
I haven't timed the game's upload but I've Archived a full set of reports to TarGzip, including about 25 years of history for a 24 team league(Historical) and uploaded it all in just over 3 minutes. Now if you don't have shell access or access to Cpanel, you may have difficulties extracting the reports on the server. You may try a PHP file that has a command to extract. If that doesn't work you may need to find another webhost.
If anyone needs help with this, feel free to contact me via AIM: fidelmontoya3
EDIT: Being that WinZip wil not extract TarGzip files, you can get PowerArchiver from
www.allsimbaseball.com and it's freeware!