Run Windows Explorer from a web application in a browser

Question

I am creating a PHP web application that only works with Google Chrome. An organization would like to have access to specific folders through Windows Explorer. This is easy in IE using the file: /// protocol, but I cannot find a good solution using Chrome.

Ive studied the registration of custom protocol handlers, but havent really found the answer. Im look for there. This requirement is covered with stone; they do not want to access files through a web browser.

Does anyone know if there is a way to launch Windows Explorer from google chrome through a special protocol handler or temporarily launch IE to open the file path? A simple method or example would be very helpful!

Thanks in advance.