Edit plist file for TextEdit I need to edit plist file of TextEdit (TextEdit/Contents/plist.info) for doing this, using Xcode. But TextEdit says that I've got no permission for edit 



I've tried to get more permission for me, so I inscribed myself in GetInfo (Pasha is me). 

But still the same problem as on the pictures above. I was searching for an answer and found this. As you can see, this answer suggests me to do what I've already done. So I hope you know the different solution for this problem.
You also need to have write permission to the directory the file is in:

sudo chown $USER /Applications/TextEdit.app/Contents/Info.plist
sudo chown $USER /Applications/TextEdit.app/Contents


After you have edited the file, change the owner of the plist and the directory back to root:

sudo chown root /Applications/TextEdit.app/Contents/Info.plist
sudo chown root /Applications/TextEdit.app/Contents


You could also run cp /Applications/TextEdit.app/Contents/Info.plist ~/Desktop/ (which changes the owner to you), edit the file on the desktop, and then run sudo cp ~/Desktop/Info.plist /Applications/TextEdit.app/Contents/Info.plist (which changes the owner back to root).

Or use another editor:

sudo nano /Applications/TextEdit.app/Contents/Info.plist