Stubify MaxFileData

So, yeah, this blows away MaxSceneViewer. We're never going to get around
to fixing that. In exchange for this massive code explosion, you get a
free MaxFileData stub type thing. It keeps all the data just so we don't
blow up Cyan's plugins. This fixes the "Missing Dll" messages people keep
whining about.
Don't do work in DllMain.

If you don't know why I did this, please Google why you should never do
work in DllMain.