Problem with assembly with space in file name.

This is probably simple but I'm new to this xaml thing and I haven't
been able to find a solution to this. I'm trying to reference a class
in an external assembly in my xaml code but on compiling I get the
error:

Unknown build error, ''clr-namespace:Frick.Coolware.Doc;assembly=Main
Document' mapping URI is not valid. Line 5 Position 5.

I've narrowed it down to the space being in the filename. Since the
dll is used by other assemblies I can't rename it. Is this a bug or am
I missing something in my reference? I've tried putting single quotes
around the assembly name but that didn't work. Can anyone help me?


Thx

Matt