Per @CassLO
To open a .tax file on your computer, you need the Desktop software. If you used the Online version you can download your return as a PDF file & open it in Adobe reader.
How do I save my 2020 TurboTax Online return as a PDF?
https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-turbotax-online-return-as-a-pdf/00/26...
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