viewportmanager.gup

Hi everybody,

I need to reuse a character from an old Max version to 3dsMax9... 
But I have a missing plugin error message with a *viewportmanager.gup file.
I don't know where I've used this function and where that's come from (model,
materials, setup?) ?

Can somebody can tell me what I have to do to correct my model?

Thanks all
Mich

* Filename: viewportmanager.gup   Class: PEN_Attribute_Holder 2 description