Show Folder Contents in Drop Down List

Hi all,

I have an input box that the user uses to type in the name of the file that he wants to open. It works but the user just informed me that he would rather have something like a drop down menu that displays all the files in the folder so that he can choose a file instead of trying to remember the name and then typing it in. I'm sure this is possible but I am having troubles.

Regards:
Michael