Sorry, but I'm afraid you didn't understand my problem.
But first, welcome and thanks for trying to help me!
Here's what I'm trying to achieve:
In my application, I have an Edit and a Button.
In the Edit, you find something like
created:yesterday size:>100mb *.avi
When I click the Button, an Explorer window should appear (being at a specific directory)
and the text from the Edit should be placed into the search box, so that it automatically starts searching.