The OpenDocument Presentation template file, carrying the OTP extension is often associated with the OpenOffice suite by Sun Microsystems Inc.. Although OpenOffice is the main software suite that opens and uses the OTP file extension, it can also be found in other products as well.
Mime type: application/vnd.oasis.opendocument.presentation-template, application/x-vnd.oasis.opendocument.presentation-template