Batch Docx Converter is a simple, but powerful Mac Utility program that will batch convert hundreds or thousands of .docx file to .doc file (or vice versa) in literally seconds! This program will save you hours and hours of tedious file renaming. The free version will do 5 conversions.
Simply drag your files onto the applications window, and hit convert - that's it. Text format and graphics are completely intact in going from one file type to the other.
||Free to try
Mac OS X 10.4,
Mac OS X 10.5,
Mac OS X 10.6