You cannot open or "feature" this file individually; it is a fragment that must be combined with all other parts (part1, part2, etc.) to extract the full game.
The file is the fifth segment of a multi-part compressed archive containing the game Guilty Gear Strive (version 1.23), released by the scene group FairLight (FLT) . Understanding the Filename GUILTY_GEAR_STRIVE_v1.23-FLT.part5.rar
: Identifies the specific game and its update version. You cannot open or "feature" this file individually;