




 
The function 
com-interface-refguid
 returns a 
refguid
 object that matches 
interface-name
, which should be a symbol as described in The mapping from COM names to Lisp symbols. This definition of this COM interface must have been converted to Lisp FLI definitions as in Generating FLI definitions from COM definitions or Including Automation in a Lisp application.
(guid-to-string (com-interface-refguid 'i-unknown))
=> "00000000-0000-0000-C000-000000000046"