Delete a file type from the content index in Search Server 2010

To delete a file type from the content index, you have to remove it from the list of file types that are crawled. After you delete a file type and perform a full crawl, content that has the file name extension that is specified by the deleted file type is no longer in the content index. Therefore, after you delete a file type, you must perform a full crawl to ensure that all previous results returned from that file type are removed from the content index.
Use the following procedure to delete a file type from the content index.

To delete a file type from the content index

1. Verify that the user account that is performing this procedure is a service application administrator for the Search service application for which you want to delete a file type from the content index.
2. On the SharePoint Central Administration home page, in the Application Management section, click Manage service applications.
3. On the Manage Search Applications page, click the Search service application for which you want to delete a file type from the content index.
4. On the Search Service Application: Search Administration page, in the Quick Launch, in the Crawling section, click File Types.
5. On the Search Service Application: Manage File Types page, point to the file name extension of the file type that you want to delete, click the arrow that appears, and then click Delete.
6. In the confirmation dialog box that appears, click OK to confirm deletion of the file name extension. The Search Service Application: Manage File Types page refreshes, and the file name extension that you deleted is no longer in the list.