@mmatthews012412 - a file ending with *.tax2020 can only be opened with the 2020 version of turbo tax.... are you trying to open it with the 2021 version????
if you begin a new return in the 2021 version, it will ask if you want to copy in last year's data... at that point the 2021 version should access the 2020 file to grab what it needs
