An XLT file is a template created by Microsoft Excel, a spreadsheet application included with the Microsoft Office suite. It contains default formatting and data for a spreadsheet and is used as a basis for creating new .XLS files. XLT files are saved in the Excel Binary File Format, which was the primary format until the Office Open XML format (.XLTX file extension) replaced it in Excel 2007 for Windows and 2008 for Mac.

XLT file open in Microsoft Excel 2016 XLT files come installed with Excel allowing you to create documents such as budget planners, calendars, and invoices from templates with pre-defined formatting. You may also create your own custom templates for reproducing workbooks or worksheets specific to your needs. Excel is the most widely used spreadsheet application in the world. It comes with every edition of the Microsoft Office suite and is used in home, academic, and business environments. NOTE: Although XLT files were replaced by the XLTX file they are still supported by Excel 2007 or later.