On your Desktop, create a dummy file with a .bat or .exe file extension
Right click any srt file, choose open with - Choose another App
Check the box marked 'Always use this app to open zip files' - IMPORTANT!
Scroll to the bottom and click 'More Apps'
Again scroll to the bottom and choose 'Find another app on this PC'
Navigate to the dummy file on your Desktop
The zip file will not open
Delete the dummy file on your Desktop and restart your PC
The file association with Notepad will then be broken!