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Firefox is ending support for Windows 7, 8 and 8.1, and users are urged to switch to Linux
(www.pcgamer.com)
This is a most excellent place for technology news and articles.
I'm most case you provably want to just send the document as PDF, don't you? For which use case do you want to send an editable document to another company?
Many companies will send you docx files out of sheer idiocity. And tell you to "send the word" to them.
And excel is always transferred as xlsx
It's called collaboration. When I worked as a toolmaker, I needed to use SolidWorks, despite not being a big fan, because our customers used SW and they were often literally on the other side of the planet.