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A is a package format used by the PlayStation 3 to install software, games, and updates. While Tekken 1 and 2 were released as official PSOne Classics on the PlayStation Store, Tekken 3 was famously absent for years, often attributed to licensing complexities involving guest characters like Gon.
Here are the main features of the file for the PS3 (typically running via a PS2 Classics emulator on Custom Firmware): Tekken 3 Pkg Ps3