Hey man! I'm sorry about the issues, unfortunately at this time I don't think it can be fully managed by Steam and this is why. It's a 64 bit build of the game when the base game and most mods are 32 bit. I'm also setting an environment variable in the bat file that's needed to play the game. The best bet would be to leave the files as is and backup any files that are being replaced when playing this mod and using the bat file.
tinnyw2
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