Determine CPU platform

Hi,

Is it possible to determine the CPU platform ?

I need to copy an external executable which is used by the plugin, but I have compiled version for different platforms, like Windows x86, Linux x86, Windows XP embedded, and for the ARM (Raspberry Pi) CPU.

I can determine if Windows or Linux is running, but for example not it it's running on a x86 or ARM cpu.

Any help is more than welcome.