Nice.tar problems

I've been having problems unpacking Nice.tar from
http://nice.sourceforge.net/install.html#source

1) Nice.tar.gz is actually Nice.tar

http://nice.sourceforge.net/Nice.tar

2) $ tar zxf Nice.tar.gz

gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error exit delayed from previous errors



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