tar.gz incorrect firmat?

From: Francesco Pietra (chiendarret_at_gmail.com)
Date: Wed Dec 05 2018 - 14:51:50 CST

Hi all
I am trying to decompress in my home at the cluster last night namd buiding

 tar -zxvf NAMD_Git-2018-12-04_Linux-x86_64-multicore-CUDA.tar.gz
gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now

$which gzip
/usr/bin/gzip
$ gzip -V
gzip 1.5

On my laptop the tar.gz opens as if it where a tar.bz2, but this also fails
on the cluster

thanks for advice
francesco pietra
by the way, a non-CUDA tarball of a few days ago opened correctly in my
home at the cluster with "tar -zxvf"

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