integrate OLE in .NET ... how to ?

Hello guys!

I have a tricky problem, let me tell you the whole story :

I have to setup an xharbour application. I need to use some of the xHarbour functions in a .NET application. Now the guys from xHarbour told me to use a C wrapper OR build an OLE (which is the solution I choosed)

Now comes the next problem, and that's why I am writing to you : How may I integrate OLE into a .NET application. Because when I simply add a reference and select the OLE (myOLEfile.dll), I get the following error :

"A reference to SampleOLEServer.dll could not be loaded. Please make
sure that the file is a valid assembly or COM component."

Thanks a lot for any hint on how to get this OLE stuff into .NET !

Regards,
Fabianus