I am a bit surprised that it says "64int" in the build description

It's a 32-bit build of perl, but it does have 64-bit integers. (Advice provided earlier in this thread that such a perl is unavailable is wrong.)

I suspect that it's perl's 64-bit integers that are creating your problem.
If you go to http://strawberryperl.com/releases.html you'll see there's a without USE_64_BIT_INT portable edition that you can install anywhere you like.
It will give you 32-bit integers - which will hopefully allow Win32::SerialPort to perform correctly, thereby proving that there's a bug in the 64-bit handling of Win32::SerialPort (which should be reported).

Cheers,
Rob

In reply to Re^5: Using Win32::SerialPort on Win7-64bit under 64-bit Strawberry Perl by syphilis
in thread Using Win32::SerialPort on Win7-64bit under 64-bit Strawberry Perl by gri6507

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