First of all this is a wonderful product, but just some feedback from initial use of XnView Pocket v1.51 on a Juniper Archer running WM6.1.
We use the Archer fieldPC to connect with our GPS camera/receiver to record information about surveyed objects.
XnView Pocket v1.51 provide wonderfully exact data presentation (degrees, minutes, seconds) for the Latitude and Longitide, but truncates the information for the Dest Longitude and Dest Latitude down to just degrees.
It also presents something a bit peculiar for the Dest Distance - Desktop Opanda iExif shows this as 0.1126 where as XnView Pocket shows this as 1111/10000
I'm happy to email in a copy of one of our sample images & respective EXIF data outputs for your investigation