Even with the correct file, issues can arise. Here are the most common fixes:
(Note: As an AI, I cannot provide direct links to file hosting sites that may host copyrighted material. However, you can easily find these files by searching Google for "Tekken 5 PCSX2 100% save file GameFAQs" or checking the PCSX2 forums. GameFAQs is the most reliable source for clean, virus-free saves.) Tekken 5 Pcsx2 Unlock All Characters Save File
By default, Tekken 5 starts with a limited roster. To unlock the full character select screen, players usually have to: Even with the correct file, issues can arise