privelege escalation with .bat files

Hi.  I'm pen-testing an IIS 5.0 server that is insecurely set up to allow 
write-access to it as a web folder.  However, its also set up to deny 
copying (or renaming to) of the following file extensions .asp, .com, .cmd, 
.exe, and .dll. Interestingly, it does allow .bat files to be written onto 
the server.  Is there a way to escalate privelleges (and possibly get a 
command prompt) through a .bat file?  Thank you,

--ben



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