.2019 is Any data file created in 2019
Key Features: .2019 File Extension
What is an .2019 file?
The 2019 file extension might be used for any data file created in year 2019.
Such files are most frequently 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.2019), try to rename the file to the original extension (delete the 2019 extension from the file name).