What do you mean with flash?
XnView doesn't support drag&drop right now, as far as I know, since it only runs under X11 as a "native" Unix-app without Aqua (or so I figure).
What conversation? What are you talking about?! ^^'
Do you mean, you cannot open XnView, and you only drop files on it's icon, for frack's sake, in the sheer hope that the app somehow magically generates a BMP for you from out of the blue?!?
Mountain Lion 10.8.2 • G530 • GA-Z77M-D3H • Sapphire 5770 • Soundblaster Audigy Platinum • 16GB-1333-DDR3 • Atheros AR9280