Published: May 12, 2010
Microsoft FAST Search Server 2010 for SharePoint can crawl and index a large number of file types out of the box or by enabling the Advanced Filter Pack. For more information, consult the articles Include a file type in the content index (FAST Search Server 2010 for SharePoint) and IFilter and file type reference (FAST Search Server 2010 for SharePoint).
Some file types require the use of a third-party IFilter. If you are using a third-party IFilter, you have to register the IFilter with Windows Search, you have to configure the file user_converter_rules.xml to process items correctly, and you have to make sure that the file type is not excluded by the FAST Search Content Search Service Application.
The article Configure FAST Search Server for SharePoint to use a Third-Party IFilter on MSDN describes how to install and register the third-party IFilter, and contains information about how to configure the file user_converter_rules.xml to make sure that content in the file format of the third-party IFilter is processed correctly.