This article describes the different file formats that use the ET file extension. It also explains how to open and convert each type.
A file with the ET file extension is a workbook file created with the WPS Office spreadsheet program, WPS Spreadsheet.
Like Microsoft's XLSX format, ET files support charts and formulas, and store data in rows and columns of cells.
ETT files look similar, but they are template files used to create multiple similar ET files.