its just that cocos2d-x uses apple’s own plist format from the cocos2d-iphone version.
I dont know if there is any other solution..
you can certainly use an xml editor - the amount of tags is just a bit excessive.
also, if your brave, wikipedia yielded a link to a chinese(?) website with an exporter for microsoft excel.. if you can get that working,
http://en.wikipedia.org/wiki/Property\_list (in “see also” section)