Preview Handler Association Editor 
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When the app loads, it looks to the registry for all registered preview handlers. It then loops through all classes and extensions in HKCR to see if each has a preview handler registered, and if it does which. Once that data is loaded (which on my machine takes approximately a second), the interface displays a combo box allowing you to pick any of the registered preview handlers. The list box with checkboxes of classes and extensions will be refreshed to show all of the classes/extensions; those associated with the selected preview handler will be checked.
Checking items that are not checked causes them to be immediately associated with the selected preview handler, and un-checking checked items causes them to be immediately unregistered for the selected preview handler. You can also check the “Only show classes associated with this handler” check box to filter down the list to make it easier to see all of the extensions/classes currently associated with the selected handler.
Tasmine
October 28th, 2008 at 3:15 pm
People should read this.
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