.2021 is File saved in 2021
Key Features: .2021 File Extension
What is an .2021 file?
File extension 2021 can be for example used for an data file created or saved in 2021.
Such files are most commonly used by various tax preparation software, but might as well contain calendar, business or just be backup of some sort.
Some file names can contain two extensions (xxx.201), try to rename the file to the original extension (delete the 2021 extension from the file name).