File treemaker.xml of Package TreeMaker
<?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
<mime-type type="model/x-tmd5">
<comment xml:lang="en">TreeMaker 5 design</comment>
<glob pattern="*.tmd5"/>
<icon name="model-x-tmd5"/>
</mime-type>
</mime-info>