How do you exclude applications from the 'open with' menu
No, they're included automatically by the OS, but if you want to reset the file, you can try this:


Open Terminal in /Applications
Type the following command: 
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
Relaunch Finder, click cmd+alt+esc and select Finder and click Relaunch
Now the "Open With..." menu is reseted!