What do I need to open XLSX files?
Although Microsoft Excel (version 2007 and newer) is the primary software program used to both open XLSX files and edit XLSX files, you can install the Microsoft Office Compatibility Pack to open, edit, and save XLSX files using an older version of Excel. ... If you use the Chrome web browser, you can install Office Editing for Docs, Sheets & Slides as an extension, which lets you open and edit XLSX files directly in the browser, either by dragging a local XLSX file into Chrome or opening one from the internet without having to download it first.
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