kernel32.RegisterWaitForInputIdle for Win32 application.

I am working on a new application that will call a DLL (which is under
development elsewhere).

For this reason I created a dummy DLL with the required function headers and
a begin/end block.

When running the application, the program stops at the application begin
location with the "kernel32.RegisterWaitForInputIdle"

I have no idea why it does this but it does seem to be related to the
connection to the DLL.
If I comment out all calls to the DLL the system does not stop.

Any help here would be appreciated.

Thanks

Stephen