(ProjectX.exe and UFO_ET.exe are binary identical. So, if you want, delete ProjectX.exe . I guess they included this two identical files for compatibility with shortcuts for versions that use ProjectX.exe as the game launcher).
Now, your game is no more the Gold version (EN-20091004 BMan’s Mod) but the Vanilla version (EN-20071001).
note: replacing the Lite version of Bman's Mod (aka Gold Edition) with the Complete version will fix some major bugs present in the Gold Edition (ex: game crashing when selling buildings repeatedly; unlimited Desert Spirit vehicles exploit).