Hello,
It is impossible to use XnView as an SVG viewer, because "CADImage" plugin from CAdSoftTools is total trash:
Seriously???

They want money for this plugin?? See how it rernders this image (it is simple enough). Wrong zoom (below 100%), wrong image size and proportion (image is cropped). No background transparency (star is not visible). Does not support rectangle stroke transparency. And cropped half the thickness of this stroke from the bottom. It couldn’t be any worse. Tatal trash.
Can you find or create a normally working replacement for this useless plugin?
Test SVG file is in attachment: