I just read that in May, WinZip introduced a .zipx format that produces smaller files than .zip. In this day of terabyte hard drives and high-speed internet, unless the savings is on the order of 50%, I wonder if anyone cares. Once a standard is established, compatibility is more important, which is why most people still use .doc format for sharing word processing files instead of .docx that was introduced by Microsoft more than two years ago.