Problem solved!

New version is up at
http://home.wanadoo.nl/sfinx98/progs/picker.zip
James,
The dosname converter actually was the only tool I didn't make just for fun. I use it for my work, part of which includes installing network applications in hospitals (our customers). Our software needs to know paths on mapped network drives in short names.
Swede,
I suppose you are right. Since you can click images in the main screen you would expect the same in the popup window. I'll look into that.
memilm,
I was not succesful with the system tray icon. The code I used before somehow did not work.