I have it running in Wineskin6 under MacOS10.15, which is 64 bit. I'm seeing a wine32on64 applet in the resources folder, along with the expected wine64 but given Catalina's crankiness, I strongly suspect that it's running in 64 bit mode. I can try running it in a linux VM if you like, just let me know which *nix you'd like to see tested. :)