Get names of files in a folder

I am using Forms 6i v6.0.8.27.  I need to programmatically get the names of all files inside a folder. Specifically, I click a button, Forms will execute GET_FILE_NAME with select_file=>FALSE. I will browse the directory tree and select a folder and upon that all file names in that folder should be returned one by one into a list (file name put in a text field).
I read package WIN_API_DIRECTORY_LIST of D2KWUTIL but doubt it can be of any help.
Any suggestion is appreciated.
Thanks,