RtlNtStatusToDosError issue

[Bill Medland]

Can I solve this through documentation or do I have to use debug?

I am implementing the LockFile stuff based on what Alexandre did to the
CorelWine last year.  Currently I have it returning error codes such as
ERROR_LOCK_VIOLATION.  However that causes RtlNtStatusToDosError to complain
about not recognising it (no big surprise) during the server call.

What is the correct solution?  To choose a status at random that translates
to ERROR_LOCK_VIOLATION?

Bill