how to append files to tar.gz
7 Zip is commonly used to open .tar.gz files on the Windows platform. It runs on XP, Windows 7, and Windows 8. If, after installed, 7 Zip does not automatically launch when you double-click the .tar.gz file, ensure the program is set to handle these archives by default. 1  Open up 7-Zip. 2  Click Tools â Options.3  Go to the âSystemâ tab. 4  Make sure âtarâ and âgzâ are checked off. 5  Click âOKâ.f, after installed, 7 Zip does not automatically launch when you double-click the .tar.gz file, ensure the program is set to handle these archives by default. 1  Open up 7-Zip. 2  Click Tools â Options. 3  Go to the âSystemâ tab. 4  Make sure âtarâ and âgzâ are checked off.