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Using 7-zip I could unzip the following file but then it would not
open in any pdf reader.
I tried the same process on another file from another source with
the extension of .pdf.gz and had no issue.
It appears that the pdf files in
http://ftp.xemacs.org/pub/xemacs/docs are corrupt.
Attempting to open any of the pdf files returns:
See attached bug.png