Does this game only work on 64-bit operating systems?

Here's the error I'm getting:

"The version of this file is not compatible with the version of Windows you're running. Check your computer's system information to see whether you need an x86 (32-bit) or x64 (64-bit) version of the program, and then contact the software publisher."

I'm afraid so. As far as I know, the game will not run on 32-bit systems. It wasn't built on or for a 32-bit OS so I can't really speak as to it's usability or a workaround.