.XLSHTML File Extension
File TypeMicrosoft Excel HTML Spreadsheet
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
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.