The save file for Street Fighter X Tekken on PC is usually located in:
You're looking for a PC save file that unlocks all characters in Street Fighter X Tekken. Here's what you need to know: Street Fighter X Tekken All Characters Unlocked Pc Save File
To unlock all characters, you'll need to edit the sfxt_save.dat file. You can use a hex editor like HxD or a save editor like Savegame Editor to modify the file. The save file for Street Fighter X Tekken
C:\Users\<YourUsername>\AppData\Roaming\Capcom\SFxT\Savedata Street Fighter X Tekken All Characters Unlocked Pc Save File
Modifying save files can potentially harm your game or account. Proceed with caution and at your own risk.
The save file is named sfxt_save.dat . You'll need to modify this file to unlock all characters.