.XLSHTML File Extension
File TypeMicrosoft Excel HTML Spreadsheet
What is an XLSHTML file?
HTML version of an .XLS spreadsheet created with Microsoft Excel, a spreadsheet productivity application; contains the HTML representation of the source XLS spreadsheet file, which can be viewed in a Web browser; used for viewing published spreadsheets without the Excel application.
XLSHTML files are no longer supported by more recent versions Microsoft Excel.