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What is .et?

Name: Kingsoft Spreadsheets File
Extension: .et
Format: Binary
Category: Spreadsheet
Developer: Kingsoft
Description: It is a file that stores lessons data like texts, images, layouts, themes, navigations, and animations. It is mainly used by teachers to deliver lessons on an interactive interface. It is developed by Easiteach.
MIME Type: application/kss
Wikipedia: .et on Wikipedia

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Last updated October 1, 2026