The OpenDocument Spreadsheet template that uses the OTS file extension is an OASIS format that is expected to become one of the standards for document sharing as a part of the Open Document Format for Office Applications. Although several software suites can open the OTS file extension, one of the most common is the OpenOffice/StarOffice suite by Sun Microsystems Inc..
Mime type: application/vnd.oasis.opendocument.spreadsheet-template, application/x-vnd.oasis.opendocument.spreadsheet-template