Identify Widget 3.1.1 Hyperlink Icon

I'm trying to figure out how to change the icon for the hyperlink. The hyperlink opens a CAD file on our network. I can get this to work with the eSearch widget, but I can't seem to get it to recognize the icon that I want to replace the default play button with. In eSearch, I just use assets/images/ACAD_icon_9_48x48x32.png in the icon tag under layer / links link, so this is the same icon I want to use for Identify.

Here's my incomplete code. I think that iconsuffix should be .dwg because it's an AutoCAD file (?). I don't know how to format the path, as your example: http://myserver/icons/ confused me.

<link includeinresults="false" field="Hyperlink_Flex" alias="Open Tap Card" tooltip="Click here to open the tap card on your local machine.">
<linkprefix>http://SNEW-GIS/servicetaps/</linkprefix>
<linksuffix>.dwg</linksuffix>
<iconfield />
<iconprefix />
<iconsuffix />
</link>

Any help?

Thanks,

Nick