Spolight importer for OG?

It seems that since I upgraded to OS/X10.10.3, though I guess it could have happened a little sooner, “.graffle” files no longer preview in Houdaspot, or in my favorite file finding tool, “Foxtrot Professional Search”.

Any ideas why and how I can get these tools to again, as they did recently, display the image of the graffle files?

thanks,