Can''t extract unix build tarball

Today I tried to extract the unix build tarball of wildfire 3.1.1 to upgrade. However tar always tells me this:

/opt# tar -xzf wildfire_3_1_1.tar.gz

tar: This does not look like a tar archive

tar: Skipping to next header

tar: Archive contains obsolescent base-64 headers

tar: Read 9262 bytes from wildfire_3_1_1.tar.gz

tar: Error exit delayed from previous errors

Have you got an idea what the problem could be? I already downloaded the file twice to check if there was an download error but it still doesn’'t work.

I found the error. For some reason w3m had compressed it again.