Yeah, this is *virused*. It's not a "false positive"; multiple scanners have flagged it as a trojan.
If anybody is still suspcious of the DarkForces+.exe, just follow the instructions from TQuin`s post
and create a .bat file with the script code, executing that instead.
His work, plus Syrion`s instructions and changes for Steam
worked perfectly for me, thank you guys!