Double clicking images opens xnview in fullscreen (un*x)

[jarmade]

Using "XnView MP v0.51 beta - un*x x64" in Ubuntu 12.04 x64

i set xnview as my default image viewer, and when i double click images in the ubuntu file explorer, it opens a new instance of xnview (even with one already open) and sets itself to fullscreen. So i have to middle click to get out of fullscreen mode everytime i do this.

Also i set the options in preferences to "One instance of program only" and "Single view for multiple files", because i like to have one xnview with tabs, but it still opens a new instance of xnview everytime i double click one in the ubuntu file explorer. It works fine if i use the xnview file explorer though.