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Describing the Filter Structure

Note

Indexing Service is no longer supported as of Windows XP and is unavailable for use as of Windows 8. Instead, use Windows Search for client side search and Microsoft Search Server Express for server side search.

 

Each filter is a dynamic-link library (DLL) file that implements an in-process COM server to supply the specified filtering capabilities. The following figure shows the overall structure of a typical filter DLL. (A more complex example could implement more than one filter class.)