This method aims at Windows users but similar methods are probably also useable in other environments.
- Right click on the SVG image file and select Open with
- Select Internet Explorer
- In Internet Explorer right click on the image and select Save image as
- In the File Format box switch from Scalable Vector Graphics (*.svg) to PNG (*.png)
- Click Save
For Ubuntu there is a simple solution described here -> http://www.upubuntu.com/2012/06/how-to-convert-svg-files-to-other-image.html