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Windows uses iFilters for extended file search capabilities. How can I verify that a certain iFilter is installed on the computer? Is there some centralized storage location where these filters are stored? What should I be looking for?

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You can see a list of all installed iFilters with locations using IFilter Explorer:

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Thanks! This is a very useful tool. – sammyg Jun 9 '13 at 10:52

The actual DLL can be anywhere on the machine since it's a COM registered DLL. Have a look at this Microsoft page for tracking down the location via the registry:

Microsoft: Finding the Filter DLL for a File

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