No, there's no way to bring a desktop TurboTax file into TurboTax online so that you can see the previous year's tax return. The only way to open a .tax20yy file is with the desktop TurboTax software for the corresponding year.
You should always save a PDF of your tax return after you file so that you can view it in the future.
You can get a free transcript of a previous year's tax return from the IRS. See the following link.
Get your tax records and transcripts
