Detect 32/64 bit in a batch file

I had the need to detect if a system was running 32 or 64 bit, I ended out with a solution much like the one shown below;

Just create two subdirectories called X86/X64 (X86 version in X86 and X64 in X64) and then create a install.cmd in each to install either the x86 or x64 version.

----<batchfile.cmd>---------------

@Echo off
if defined ProgramFiles(x86) goto INS64
goto INS32

:INS32
Echo 32 bit installing
call x86\install.cmd
goto END

:INS64
Echo 64 bit installing
call x64\install.cmd
goto END

:END