TGZ is the file extension for a so-called tarball archive, which was compressed with gzip. Gzip stands for GNU zip, which is a free compression method based on the Deflate algorithm. Since Gzip archives can only contain a single file, the files to be archived are first combined with tar to form a tarball and then packed with gzip. These files have either the double ending .Tar.Gz or simply .Tgz.
TGZ archives can be unpacked by just about any packer, be it Linux, Windows or Mac
Most often resolving problems with opening TGZ files is very simple. Just install an appropriate program that supports such files. All of the listed programs support TGZ files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of TGZ files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate TGZ files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the iArchiver applications is not on the list, select "Browse" option in order to manually locate the directory where iArchiver has been installed.
Sometimes problems with opening TGZ files may not lie with the application itself, but can arise due to other causes, such as: