We assume you refer to VC++ 6.0. Our FIW does a better job in VS.NET.
We will make VA X smarter with certain files types. It's unlikely we'll make VA X smart enough to open every type of file. For those we don't expect, we try to open as text.
Yes, I'm referring to VS6 here, and the "Open Files in Workspace" dialog. Seems that all graphics formats do not open in the resource editor. Just HTML and similar.