Although Unix systems normally include all of the tools you need for post-exploitation, Windows systems are notoriously lacking in a decent command line toolkit. The UploadExec payloads included in this release allow you to simultaneously exploit a Windows system, upload your favorite tool, and execute it, all across the payload socket connection. When combined with a self-extracting rootkit or scripting language interpreter (perl.exe!), this can be a very powerful feature. The Meterpreter payloads are usually much better suited for penetration testing tasks.