"The correct answer is .xltx Key Points .xltx: An XLTX file is a template created by Microsoft Excel, a spreadsheet application included in the Microsoft Office suite.  It contains predefined settings and layout information used to create multiple Excel spreadsheets (typically . XLSX files) with similar formatting and properties. The XLTX format replaced the older XLT template format from Office 2007 and earlier. Additional Information .xlsm: An XLSM file is a macro-enabled spreadsheet created by Microsoft Excel, a widely-used spreadsheet program included in the Microsoft Office suite.  It contains worksheets of cells arranged by rows and columns as well as embedded macros programmed in the Visual Basic for Applications (VBA) language.  XLSM files are saved in the Open XML format introduced in Microsoft Office 2007. .xlsx: An XLSX file is an Excel spreadsheet created by Microsoft Excel or exported by another spreadsheet program, such as OpenOffice Calc or Apple Numbers. It stores data in worksheets, which contain cells arranged in a grid of rows and columns, and may also contain charts, mathematical functions, styles, and formatting. " Answer from Testbook on testbook.com