Builtin dll not being used despite dlloveride

I want to use a built-in dll instead of a native one, but because there 
is a native version in the current directory, it is being used instead. 
+module shows something along the lines of looking in the config and 
then trying to load the native version even though I have it 
specifically say to use the builtin version only. Moving the naive dll 
out of the way isn't a good option. Is this a bug? Should I look into 
getting a fix for this?

Marius