The only way to see the contents of a .tax file is to open it with the TurboTax software for the corresponding year.
You could try TaxPrinter. You send them your .tax file and they send you back a PDF of the tax return. TaxPrinter has no connection with TurboTax. I have never used TaxPrinter, so I cannot make a recommendation. I'm just making you aware of it.
