Just to get this clear, of course I know there is a difference between the TT software program and the file it created for my 2023 taxes, the latter of which has disappeared. I have both the 2023 and 2024 Turbotax programs installed, as well as those for many prior years. There is no reason why the program installations or their updates should have disturbed my 2023 tax file created by Turbotax, but it has disappeared, and judging from other posts here I am not alone with this problem. I will look in the One Drive backup next and see if there's anything there, and report the results. I'll also search for the file using the different extensions you mention.
