There seems to be something strange about the apache server of AMD.com. If you try to wget a .tar.gz file from it, the file will be automatically unzipped. But if you try to get the same file by firefox, it won’t. The file in question is http://www.amd.com/files/connectivitysolutions/geode/geode_lx/Patches_Linux2.6.11_Common_02.03.0100.tar.gz
I guess the reason is this. The .gz files get Content-Encoding: gzip, so wget believes the data stream is compressed. The downloaded tar.gz will in fact become a tar file instead of the expected gz. Firefox actually has a workaround for this.
Maybe I should notify the webadmin of http://www.amd.com about it… if I can find the email address.