Where are iFilters stored in Windows?

Question

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?

Answer 1

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

Answer 2

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