Sorry, but what you are talking is wrong!
I did this exactly what you wrote before! In this way u could not receive any dropMimeData event if u want drag & Drop files from the windows explorer.
I read also the docs, but nothing about such explanation.
I donn't have problem with the drag & drops problem, but I have problem to drops files from outside of my program into to my QTreeWidget .
Tell me more and not send me just one function what anyway my self already found in the documentation!