If you want to skip the tedious grind and jump straight into local multiplayer or practice mode with a complete roster, using a pre-saved "all characters unlocked" file is the fastest solution. Why Use an Unlocked Save File for PC?

: "The file is outdated or glitchy."

Here’s a straightforward write-up for downloading and using a save file to unlock all characters in Tekken 3 on PC (typically via a PS1 emulator like ePSXe, DuckStation, or PCSX-Reloaded).