What is an XLSX File (and How Do I Open One)? - How-To Geek
https://www.howtogeek.com/392333/what-is-an-xlsx-file-and-how-do-i-open-one/
WebOct 26, 2018 · XLSX files are files used in Microsoft Excel, a spreadsheet application that uses tables to organize, analyze, and store data. Each cell can contain text or numerical data, …
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