Checking iFilters
Search 360 will automatically index all documents with the suffix RTF, ANB, LNB, TCV, XML, CSV, and TXT. All other document types require that an appropriate iFilter is installed on the machine on which indexing is performed.
iFilters are third-party plug-ins that enable index services, such as the Search 360 Index Service, to scan the different document types that can be embedded in entity and link records and extract index terms. Suitable iFilters might already be installed depending on the version of the applications you are using. The easiest way to determine whether the correct iFilter is installed is to import a document of the required type, update the index and then search for a term that you know is in the document.
If your document does not appear in the search results, you must to install the related iFilter. See Installing iFilters for further details.