Apple Inc. 's TextEdit has very basic read and write support for Office Open XML text files starting with Mac OS X v10. 5 .
Apple Inc. 's TextEdit is the built - in word processing program of Mac OS X .
Apple Inc. 's TextEdit , the built - in word processing program of Mac OS X , has very basic read and write support for Office Open XML text files starting with Mac OS X v10. 5 .