Hey guys, i installed fcam via app manager in n900, rebooted and took a picture from fcam(n900)

Now my question,
the picture are in ".dng" format and i can open it only in fcam and cannot load it in n900 default pic viewer, also the picture format is not openable in win default pic viewer.
so how can i make the fcam take pic in other format? OR,
how can i make it visiable in default pic viewer in nokia n900?

Guys plz help me out on it ,, any suggestion would be appricatable ?