Mimetype Icons applied to application and not files of mimetype

[Bryce Carson]

I can successfully package the new mimetype, text/slim, so files with the
.SLiM extension are of the mimetype.

However, the application instead uses the mimtype icon rather than the icon
in hicolor/apps/rDNS.svg, and no icon is applied to the .slim files.

This seems a little poorly documented. I've read a couple issues on the
topic and there's mention of a prefix which should be the same, but no
permutation of naming I've tried has worked as expected.

What is the proper way to package an icon for mimetypes and have it applied
to the mimetype specified in the XML?
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