Control treeview of other application

[durexlw]

How do I control (as in 'move around in') a treeview of another application?

For example, say I want to make a Lazarus application that if I click a button, it check if a windows explorer is open, if it is, then it opens "C:\" in the treeview of that windows explorer.

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In reality I want to control a finance program, but if someone can give me a few ideas or example code on how to do the above, I'll manage to translate it.

Thanks in advance!