SVG icons are not resized on IE
From @oparoz on September 13, 2015 12:50

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Copied from original issue: owncloud/gallery#334
The solution is to use the PNGs on IE.
From @karlitschek on September 13, 2015 15:8
@jancborchardt any idea?
It's a known issue http://caniuse.com/#search=svg
IE9-11 desktop & mobile don't properly scale SVG files. Adding height, width, viewBox, and CSS rules seem to be the best workaround.
One solution in order to keep SVGs for IE is to fix all the media type icons in core.
Keeping open, in case someone wants to play with SVG and IE.
In order to see the difference, you need to upload a broken JPG to a folder and to load that folder in Gallery in both Firefox and IE. One will use the SVG icon, the other the fallback.