[http://www.openoffice.org/ OpenOffice.org] pioneered the ISO/IEC standard [[http://http://en.wikipedia.org/wiki/OpenDocument OpenDocument]] file formats (ODF), which it uses natively, by default. It also supports reading (and in some cases writing) a large number of legacy proprietary file formats (e.g.: WordPerfect , StarOffice, Lotus software, MS Works, Rich Text Format), most notably including Microsoft Officeformats