You will find that one great advantage of 64bit-Environments is the address width of 8 bytes instead of 4 bytes. You can use this to identify whether a script runs in a 32-bit or 64-bit environment. You should simply take a look at pointers and their address width:
if ([IntPtr]::Size -eq 8) { "Ein 64-Bit-System" } else { "Ein 32-Bit-System" }
