That requires the RPCS3 (PS3 emulator). The save structure is completely different. This guide focuses solely on the PS2 original.
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Once you have the Tekken Tag Tournament PCSX2 save file link file downloaded (it will likely be a .zip, .ps2, or .max file), follow these steps: Article: Finding and Using Tekken Tag Tournament PCSX2
.psu / .psv (Folder/Exported Saves)These are individual save files exported from a memory card. These are the most common files found online. To use these, you usually have to import them into an existing memory card file within PCSX2. Q3: What about save files for Tekken Tag Tournament 2