PostgreSQL OLE DB Provider

Do you know any attempts to write native OLE DB provider for PostgreSQL (it
would give broader support for VS Net). I would like to write such provider
and I want to know if sombody tried it before. Could somebody help me with
protocol issues (I have read Backend/Frontend Protocol and studied ODBC
driver) Are there any other interesting issues which aren not covered with
it. I would like to know how could I implement precompiled statements. Is
there any way to send it without parameters to able backend to chache it for
future use or it is not necessary. Are there any problems with large objects
?