Comment 4 for bug 822178

> Microsoft has to write an entire SVG rendering engine to create thumbnails.

The latest version of IE does support SVG -> Microsoft does have the knowledge as well as source code for rendering SVG files.

Related: Microsoft has joined the w3c SVG working group:
<http://blogs.msdn.com/b/ie/archive/2010/01/05/microsoft-joins-w3c-svg-working-group.aspx>
<http://arstechnica.com/microsoft/news/2010/01/microsofts-collaboration-on-svg-is-a-win-for-the-open-web.ars>

> There is currently only one 3 party application which
> helps with creating SVG thumbnails. Irfanview

There is a widget for Opera which works as stand-alone SVG file browser (with thumbnails) and viewer:
<http://widgets.opera.com/widget/15172/>
Note: install the latest version (Opera SVG Viewer v2.0b5) from here:
<http://my.opera.com/SpShut/blog/>