How to open a local folder using Google Earth

I have a photo within Google Earth. I would like to be able to click the photo or description to open the folder directory. I believe the href needs to be modified. How can the code be modified to open the local folder?

Screenshot here

<a href="file:///C:/Temp">Click Here to open Folder</a> <img style="max-width:500px;" src="file:///C:/Temp/Photo1.jpg">

Solution

You can link to a local folder only if you change two of the default settings. Open Google Earth and select Menu / Tools / Options / General

In Display panel, check "Show Web Results in external Browser" option
In Placemark Balloons panel, check "Allow Access to local files and personal data" option

Then create a KML file in a text editor (such as the following) and launch it in Google Earth.

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Placemark>      
    <description><![CDATA[

<a href="file:///C:/Temp">Click Here to open Folder</a>
<img style="max-width:500px;" src="file:///C:/Temp/Photo1.jpg">

      ]]>
    </description>  
    ...
  </Placemark>
</kml>

For more details on using HTML in KML description balloon, see KML Reference.