Have you grown familiar with the default preview movie in the Silverlight template thumbnail in Expression Encoder 3? No problem, just change it. Go to the C:\Program Files\Microsoft Expression\Encoder 3\StockContent folder and replace the sl.wmv with your own, making sure that it has the same filename.
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Tip 228: Keep things interesting in the Silverlight template preview window.
Jan 17 2010

Get the ball rolling!