if you have the K-Lite software installed... then just RIGHT CLICK your webm video file and look at the top of the menu for MediaInfo.
As to the comment above about deleteing in_mkv.dll - that is specific to Winamp. It is a simple way of removing the plugin Winamp is using to decode this file. (If you look into C:\Program Files(x86)\Winamp\Plugins\ you will see all the bits that make Winamp do the magic it does...)
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