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IFilter Component

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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.

 

The IFilter component is an in-process COM server that extracts the text and values for a specific file type. The appropriate IFilter component for a file type is called by the Filtering component.

A customized IFilter component can be developed for almost any selected file type. The standard IFilter components supplied with Indexing Service include the following ones.

File Name Description
mimefilt.dll Filters Multipurpose Internet Mail Extension (MIME) files.
nlhtml.dll Filters HTML 3.0 or earlier files.
offfilt.dll Filters Microsoft Office files: Microsoft Word, Microsoft Excel, and Microsoft PowerPoint.
Query.dll Filters plain text files (default filter) and binary files (null filter).