How to write a code to open and read text file by clicking on the "text file"

[buran]

DeaD_EyE provided one option, but also pointed the drawback
one alternative would be to add entry (shortcut to your python script e.g c:\python37\python.exe c:\path_to\yourscript.py) in the Send To right-click menu. So you can right click on the text file and select SendTo->your python script.

https://www.howtogeek.com/howto/windows-...d-to-menu/