XLTM - Excel Open XML Macro-Enabled Spreadsheet Template is a template file type that is made by using Microsoft’s Excel. Excel is widely known as a spreadsheet application. This file type contains the default setting and other information related to layout properties for macro enabled spreadsheets and much more. It is also widely used to make new macro workbook files that are capable of being opened in Excel 2007 and later for the Windows operating system. Macs can use it with Excel 2008 or later. These files can usually be opened by previous versions of the spreadsheet application by using Open XML component support to help it along. This has quickly become the industry standard for spreadsheet creators and desktop developers.