How do I get a previous year's tax return from a .tax file

A TurboTax tax data file which has a file extension of .taxyyyy, where yyyy is the tax year of the data file can only be opened by the TurboTax software of the year of the data file.

Do you have a .taxyyyy file?  What year is it?  Where did you get it?  If you downloaded it from Online version you should be able to download the pdf file.   If you only have the .tax file you need that year’s Desktop program installed to open it.  

You could try the TaxPrinter service (not connected with Turbo Tax) to convert a .tax file to pdf at

http://www.taxprinter.com

They might be expensive and it is probably not safe to email tax returns back and forth.

OR get a copy from the IRS -

http://www.irs.gov/Individuals/Get-Transcript