This is a test program which shows how the dll works.
You click either on the menu "file/open" or on the button "open file".
Then you get a 3D file open dialog window
where you can move in the file system like in TriDComm.
After doubleclicking on a file name in the 3D window
you get the name of the directory and the file selected.
Here is the source of the test project.
Here you can buy the 3D file open dialog dll.
buy it