You can specify the URLs for the icons that represent subdirectories and file types in directory listings. The URL is translated through the server's resource mapping rules. For the icons to be retrieved, you must make sure that the mapping rules allow the URL to be passed. You may also specify the alternative text to be displayed by a browser that cannot display images.
If your server is a proxy, you must specify a fully qualified URL pointing to your server and map the URL to a local file. An example of a fully qualified URL is http://your.server/cpicons/TEXT.gif. Also, your server configuration must include PASS rules to allow icon URLs to be passed (for example, PASS /cpicons/*).