Load local images from URL on Web Player

I have a dashboard that loads local images into tables and tooltips using "Image from URL" and "file://" instead of "http://". In Tools > Administration Manager > Preferences > Everyone > Application > ApplicationPreferences, Allow Additional File Extensions is set to "True". This works perfectly in spotfire desktop, but when I open the dashboard in web player it says "The value could not be rendered". Is there a way to load images stored locally in web player? 

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