File with .ET extension contains data such as formulas, functions and charts/graphs in form of a spreadsheet of cells grouped in rows and columns. This file type is associated with Kingsoft Spreadsheets, a software included in free version of Office WPS office suite package. ET file format is similar to Microsoft Word XLS and XLSX formats and can be exported to those formats.

Kingsoft Spreadsheets software saves files in .ET format by default. This software also supports .ETT file extension that is used do create ET templates for storage of graph style data, graphical elements, cell formatting data and tables for various types of documents. Templates are used to create documents such as calendars, budget worksheets or invoice templates more easily.