Dialogs are not read top-to-bottom, left-to-right. You read the buttons first, then the title bar (if easily visible), then you'll scan the text, then if you absolutely must you'll waste seconds of your valuable life actually reading the whole text in sentence form. Since the "Delete file" text is nearly invisible in that screenshot, that dialog will be read like this:
[Yes][No]
Bla bla bla bla bla bla bla bla bla bla bla bla Recycle Bin?
Bla bla bla bla bla
Bla bla bla bla bla
Bla bla bla bla bla
Which is fine if you meant to bring up the dialog, but what if you brought it up accidentally? Many users get in the habit of always clicking Yes and OK. Buttons that will have destructive actions should be labeled clearly with what will happen.
I'll buy that.