You can open .DAT files that contain text, with text editors, like Notepad, Notepad++, VS Code, etc. But it is not possible to know what contains in a DAT file.

Read text file by console or dialog Ibrid application: Like CLI, use structopt for read args, when there is first argument. Otherwise, use native-dialog for open a GUI dialog for pick a file.

# In Python, a `with` statement is often used in file handling to open a file and then automatically close the file after reading it.

You can view a Text file in Command Prompt or PowerShell in Windows 11/10. You can view the entire content of TXT, a specific line, etc.