The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
@golannard If you're looking for the location of your FA install, I imagine it's under steam/common/steamapps somewhere. You can find the install directory directly by going to your steam library, rightclicking the supcom FA game, and finding that option that opens the install directory.
