🚀 go-pugleaf

I have two problems.

Problem 1.
I want the user to select a directory (AKA folder), not a file. I can
do this with TOpenDialog. Actually this dialog serves to select a
file, but when I strip the last part from OpenDialog->FileName, the
directory remains.
I do not really like this method, since it confuses the user.
Furthermore it is impossible to select an empty directory.
Any solutions?

Problem 2.
The user runs my program and selects a directory with TOpenDialog. He
closes the program, reboots the computer and restarts the program.
When he starts TOpenDialog, I see that it has remembered the
directory, although I wrote no code to remember it.
OpenDialog->FileName is empty before TOpenDialog is started.

Where is this data stored?
Can I access this data without having the user start TOpenDialog?
-- 
Jos�