You might ask: "Why not just play the Sonic 3 Complete .bin?"
If you own Sonic 3 & Knuckles on Steam, the game uses a wrapper. You can extract the raw .bin from the Steam files using Sonic 3 & Knuckles Extractor Tool , which now outputs the "new" lock-on format natively. sonicknuckleswsonic3bin file new
For modders, a "new" base .bin is essential for: You might ask: "Why not just play the Sonic 3 Complete