I don't know if it is a bug or not, but it seems setting one node to accept one file is setting all other nodes to the same setting.
I added dreamweaver and other adobe programs to my dock and currently all are set to don't accept files.
But dropping a .txt is opening dreamweaver and for testing also premiere.
I see that i can set filters, but they are useless when dropping is set to not allow, but do so.
 for me it is a bug.