The full text search can search all kinds of documents, including graphics. The following formats can be searched:
XML files and documents with an XML-like structure
Microsoft® Office documents
Documents in OpenOffice format OpenDocument (file extension .odf)
PDF documents
Documents in electronic publication format (epub)
RTF documents
Text files
Compressed formats (such as zip); the archive is unpacked and the documents contained are searched.
Audio formats (such as mp3), Metadata will be extracted.
Graphic formats (such as jpeg), Metadata will be extracted.
Video formats (such as flv), Metadata will be extracted.
Documents in mbox format. E-mails are extracted and searched.