20260318-0 Excel XLSX Excel XLSX 2012-03-19 2025-02-11 2012-09-01 XLSX 2012-11-27 2012-09-27 Office Open XML Workbook XLSX is the default file format for Excel 2007 and later workbook used for Microsoft Excel spreadsheet which features calculation, graphing tools, pivot tables and a macro programming language. XLSX is in reality a ZIP compressed archive with a directory structure of XML text documents. application/vnd.openxmlformats-officedocument.spreadsheetml.sheet application/vnd.openxmlformats-officedocument.spreadsheetml.sheet .xlsx xlsx XLSX false XLSX 2012-09-01 XLSX 500 true true true true true false true https://www.iana.org/assignments/media-types/application/vnd.openxmlformats-officedocument.spreadsheetml.sheet