How do I detect child dialog(file upload dialog) on iExplorer ?

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C++

I'm trying to detect file open dialog on internet explorer.

Now, I'm detecting it whether corresponding title name using FindWindowEx() api.

But if the same upload dialog's name and other program's file open dialog ( ex: word, notepad etc. ), this way can't distinguish whether what is it from.

I wish to get more good classifiable way.

could someone help me ?

thank you.