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You can specify file types (indicated by file extensions) to include in the content index when crawling content sources. For example, you might want to include files with .abc and .def extensions in the index. The inclusion of a file type applies only to content that is stored outside the portal site and included in the content index through content sources. The inclusion of a file type does not apply to content stored in the portal site.
If a file type has an IFilter associated with it, the IFilter must be registered on the computer running Microsoft Office SharePoint Portal Server 2003 and crawling that file type. After the IFilter is registered, documents of that file type can be crawled and included in the index. If you add a file type but no filter is registered, only the file properties are included in the index. The procedure to register an IFilter varies, depending on the particular IFilter you are registering. See the documentation accompanying the IFilter for the proper procedure to register it.
SharePoint Portal Server includes filters for the following: