Certain standard IDL files have already been converted to FLI definitions as part of the COM API modules. These are listed below and should not be converted again.
Pre converted IDL files
IDL file
Part of Lisp module
UNKNWN.IDL
com
WTYPES.IDL
com
OAIDL.IDL
automation
OLEAUTO.IDL
automation
OCIDL.IDL
automation
LispWorks COM/Automation User Guide and Reference Manual - 19 Dec 2011