Every time I try to download or save a .tar.gz file, I get something like this:

The popup is simply wrong, I've used the right .tar.gz extension. Clicking on Use .gz saves the file as .tar.gz, and clicking on Use .tar.gz saves the file as .tar.tar.gz.
Is there a way to fix this?
Downloads. – houbysoft Jun 14 '12 at 16:37