How to open a file in python 3 -

i want open it not read it.
tried this:

x = open("filename", "r") abc = x.read() x.close() 

the above code read file, did not open file.
file "bat" file

open creates stream of data associated file. not initiate file viewing software.

os.startfile('path/to/file.ext') # opens file in respective program