Can I edit the "Open with..." menu in Apple Mail / Finder?
You can remove entries from the CFBundleDocumentTypes dictionaries in Info.plist files, but it is not very practical.

For example DVD Player won't be listed as a supported application for .dvdmedia files if you:


Run sudo nano /Applications/DVD\ Player.app/Contents/Info.plist and remove the entry for dvdmedia.
Run /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -f /Applications/DVD\ Player.app/.
Quit and relaunch Finder.


Sandboxed applications like TextEdit and Chess have crashed on launch since 10.8 if their Info.plist has been modified. Changes to Info.plist files might also get reverted by updates.