[Haskell-cafe] MAPI provider?

Hi, I apologize if this is off-topic or stupid. I'm not very familiar (at all) with Windows programming... I have a Haskell program that I want to get called when someone sends a message on Windows. This sending a message will happen from various programs that call MAPI. It doesn't seem very easy to plug into MAPI from Haskell as a MAPI *provider*, though if anybody has examples, that'd be great. Does anybody know of an MAPI provider that receives send requests, writes the data to a file, and then just invokes a program passing the file as a parameter? That would let me do all I need to plug in. Thanks, -- John