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openfile
xlsx file is an extension that is used for Microsoft Excel Open XML spreadsheets(XLSX) file created by Microsoft Excel. You can open this format in other spreadsheets applications as per your choice.
Once again I fell down the martial arts rabbit hole and am plumbing the murky depths of the internet's various martial arts and fighting crafts echo chambers.
If you're not actively involved and only get up to speed every few years or so, you can see the tide of public opinion flapping worse than my dong while I'm skipping naked down a hallway.