Holy crap it worked! I re-downloaded the files, and this time, my virus scanner told me it deleted both the .exe and the core.ddl, so I restored them, and now the game works!
I just have to say, I didn't expect anyone to reply to me, so I find it awesome that not only are you barely keeping alive this (otherwise) lost DLC, but you are actively helping out anyone that asks. Keep up the good work. Thanks to you, I can experience Russian Postal.
pogun1
John joined
Hey, how's it going?