custom file type icon simply ignored

["Kotrla Vitezslav" <kotrla ceb cz>]

I'm trying to persuade Nautilus 2.4.2 to use custom icons for custom 
file types. When I associate new file type, I correctly see file type
description, suffix and associated app in file properties, but icon
shown by Nautilus is still the same default green footnote used for
'common' files (even if in filetype association dialogue there is correct
icon there).

Is it a bug or feature?

Thanks for explanation.

Vit Kotrla