I’m open to suggestions how exactly though. I don’t really like the idea of showing this type file as ghosted out (like we do for “Hidden” files). This could make them look unavailable and unselectable, when in fact they are just as available as any other file, just with a short delay.
And I certainly wouldn’t want to change the icon type as knowing the file type is more important than its availability. Not much room to do much when in list view. But give it a think and maybe make a mockup of what you have in mind.