Before extracting, check the size. If parts .001 through .008 are each 4GB (common for 1fichier links), .009 should be between 500MB and 2GB. If it is significantly smaller or exactly 0KB, the file is dead.
God of War: Ascension was never officially released on PC. To play it on a computer, you must use a PlayStation 3 emulator, and the most advanced one is , an open-source, multi-platform emulator for Windows, Linux, and BSD. God of War Ascension -Gnarly Repacks-.7z.009
You will need a program that understands multi-volume .7z files. The primary tool for this is , which is free and open-source. Before extracting, check the size