may be an older winrar. Current winrar versions unzip both files for you so you never see the double compression. A tgz file is the same thing as a tar.gz file, which essentially is a .gz compressed file inside of a .tar compressed file. If your version of Winrar isn't opening it correctly you can try changing the file extension to tar.gz and if it still doesn't work, try unzipping what you have, and rename the file you unzip to a .gz file. Maybe that will work...
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