In most cases I have problem with zoom function: big pixels. Here is a screen capture made on "Device Emulator", but it is the same thing on a true Mio P350.

But if I
- select "View-Original Size"
- view and close an image
- select "View-Fit to window (large only)"
- view the image

- then the zoom works well

The tip given in
http://newsgroup.xnview.com/viewtopic.php?t=7336
doesn't work for me: no menu appears
I'am using XnView 1.35 on a Mio P350 or "Device Emulator"
Thank you