This is the most common manual method. The game stores character unlock data in a simple script file.
Street Fighter X Tekken PC: Complete Patch 1.08 Character Unlock Guide street fighter x tekken pc patch 108 character unlock link
This guide explores the legitimate community-driven methods to unlock the full roster of 55 characters, including the infamous "locked-on-disc" DLC and Sony-exclusive guests. The Patch 1.08 "Version 2013" Legacy This is the most common manual method