The .tax2022 file is the data file that you want. It's possible that the client saved several versions of her tax return at various stages, and sent you the wrong one.
It's not clear to me whether you are opening the file in TurboTax or in ProConnect. If you're sure you have the right file, and it's not opening properly in ProConnect, you should ask for help in the ProConnect Community.
If it's not opening properly in TurboTax, make sure that your 2022 TurboTax software is fully updated.