I have a shared disk attached to my Airport Extreme, which I can connect to remotely in OS X through the finder via command - k, and entering in the proper address:

afp://test.dyndns.org:1111

1111 being the port I've reserved for the disk in the AE port mapping.

This is such a great feature, but I don't always have access to a Mac.

My question is how can I connect to this drive via Windows XP?

Please note, that the shared drive is a Drobo FS and formatted to handle both Windows and Mac OS.

I've tried mapping a network drive via My Computer -> Tools -> Map Network Drive and entering:

\\test.dyndns.org:1111\Drobo-Name

I've also tried Start -> Run and entering the same, both with and without the port #.