You would need the 2017 Desktop program installed and updated to open it. But 2017 is too old to get or install. Where did you get the .tax2017 file?
Sorry you can’t install old programs. They only support the last 3 years. If you can’t download or open the pdf file and only have the data file ending in .tax20yy you could try the TaxPrinter service (not connected with Turbo Tax) to convert a .tax file to pdf at
OR get a copy from the IRS -
SAVE YOUR TAX RETURNS !
EVERY year before mid-October you should save a copy of your tax return as a pdf and print a copy of it for your records. That way you will not be searching online frantically when you need it for a lender, FAFSA forms, your next tax return, etc.
In order to transfer a past year return to the new return you need the tax file
NOTE: TurboTax and the IRS save returns for seven years. Returns older than seven years are purged.