885 Microsoft PowerPoint for Macintosh 4.0 Presentation Microsoft PowerPoint Presentation is a proprietary binary file format developed by Microsoft Corporation used to store presentation files created in the Microsoft PowerPoint presentation system. This record describes version 4 of .ppt file format for Macintosh, released in October 1994. Versions prior to version 4 of Microsoft PowerPoint also use .ppt as extension, however they are not compatible with each other. Microsoft made backwards compatibility an optional add-on after Office 2003 and appears to have removed it altogether in Office 2010. Text 1 Digital Preservation Department / The National Archives 28 Sep 2009 08/2023 (v.113) - Description updated and MIME Type added. Internally researched. 15 Aug 2023 application/vnd.ms-powerpoint MIME fmt/179 PUID ppt File extension