I know this thread is a couple weeks old, I saw it on Wine Weekly News...
[A. Julliard]
If we want to use .idl files we'll have to come up with our own compiler, and then we can put the .idl source in the tree and compile it at build time.
[Ove Kaaven]
Hmm. Even when using flex and bison, it sounds like a fair amount of work... wonder who would volunteer?
The FreeDCE Project has a DCE IDL compiler which I understand is mostly compatible with MIDL.EXE. See http://sf.net/projects/freedce and http://www.dcerpc.net/ (the latter seems to be malfunctioning at the moment).
Peter