*** On OSX the options are in the Preferences (edit extensions to share/show in Sharing->Shared Extensions). I recall a while ago having to manually add ".toast" there in order to search for and share those kinds of images. I think that list no longer prevents the display of results, since I was able to search for ".torrent" extensions recently. ***

Actually, according to the way that the preferences are labeled, that list has no bearing as to what will be displayed, it only affects what is shared to others. So that doesn't address my request/enhancement/etc. I appreciate all of the suggestions, but they do not impact my idea whatsoever -- but good try. :-)