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

[DeaD_EyE]

You want to associate text files extension with a Python program?
This is possible, but I think it's not a good idea to open all text files generally with Python.

1. Associate the extension .txt to 'py C:\windows\your_script.py'
   
2. Clicking now on a .txt file should call following: 'py C:\windows\your_script.py filename.txt'
   

Then you read with sys.argv[1] the first argument from the commandline.
sys.argv[0] is the python-script.

Then you can do what you want with the path.