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If I were to make a dll that would open some kind of 3d file format, did the dll have to create the 3D object itself, or is anyway to provide info to DBPro about the object?
I hope I have written this in a way that expresses correctly what I want, if someone doesn't understand, please say so and I'll try to explain in another way.

No one?
At least say something, please...

that a hard question ...
Basically your DLL would need to be a full plug-in so it could
access core functions from within DBPro. I think there are only
a few (maybe 5 users) that could fully answer your Q and back it up.
The best option I can come up with would be to:

1 - pass a pointer to a memblock to your DLL
with a filename ...
call dll 1,"LoadCustomFile",ptrMemblock,"Myfilename"

2 - in the DLL
read the file and internally change the format to
a standard .X format and store that in the memblock

3 - in DBPro
Make Mesh from memblock ....
Make Object From Mesh ....
and so on.

Not exactly a simple process, but you could
also test it out from DBPro without creating a DLL

The reason your DLL needs to access core DBPro functions is
because your object must be added to the global list ...
So, your DLL would need to call the Make Mesh ... function.

That should at least explain why not many responces ...
A simple answer would be "No" or maybe "Beyond the scope of the class" while the real answer is "Not many can answer that one",
at least not without help from Lee.

Thanks a lot for answering.
I think that clears what I had in mind.

There are some books on graphic file formats, 3d files etc., at amazon books.
goto amazon.com and do search on file formats. Or goto exact site I refer to here:

http://www.amazon.com/exec/obidos/search-handle-url/index=stripbooks:relevance-above&field-keywords=file%252520formats&search-type=ss&bq=1&store-name=books/ref=xs_ap_l_xgl14/102-9840533-9675369

Think that will help you parse some 3d files and convert to other 3d formats.