Game Archive UnPacker is described as 'Plugin for Total Commander' and is an app in the Development category. There are four alternatives to Game Archive UnPacker for Windows, Linux and Mac. The best alternative is Dragon UnPACKer, which is both free and Open Source. Other great apps like Game Archive UnPacker are MultiEx Commander (Free), Ravioli Game Tools (Free) and QuickBMS (Free, Open Source).
This program allow you to open the game resource files in an explorer-like interface then extract the content at will. More than 80 games are supported directly. It is plugin based making easier to add new archive file formats.
MultiEx Commander makes it possible to extract files from and import into hundreds of game resource archives. Most games use large files in which they save all necessary files. This usually includes sounds, music, graphics, scripts and code.