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Disable Windows XP AVI Preview
HKEY_CLASSES_ROOT\CLSID\{87D62D94-71B3-4b9a-9489-5FE6850DC73E}
Windows XP examines AVI files for its properties for a preview of it when exploring files.
This can take a long time depending on how big the media is and how many you have.
By placing a minus sign in front long string of alpha-numeric key, like so: -{87D62D94-71B3-4b9a-9489-5FE6850DC73E},
you can disable this yet still double-click and view media files normally.