> - In my spec I have successfully used xdg-mime and xdg-icon-resource so
> that files with my custom extension (.supes) has my custom icon.

bad.  xdg-* tools are intended for user-space, not system-space (ie, not
to be used in pkg scriptlets).

See here for details,
https://fedoraproject.org/wiki/Packaging/ScriptletSnippets

sections on 'desktop-database', 'mimeinfo', and possibly 'icon-cache'


Thanks Rex!  I did not notice my icons and mime types associations were being set on rpmbuild.  Now I have my application associated with my custom mime-type using scriptlets.  

However, I am not clear on how I am supposed to associate files with my mime-type with a custom icon.   

xdg-icon-resource made it pretty simple to associate an icon with a mimetype, but if I am reading https://fedoraproject.org/wiki/Packaging/ScriptletSnippets#Icon_Cache correctly, I need to create an icon for every theme?  Is there a preferred way to just set a custom icon for all themes?