Instruct: Classify a review into positive or negative sentiment.
Query: Improvement on solid foundation

This indispensable Macintosh utility has been improved with this release in two ways. First, it is fully compatible with MacOS X 10.2 (Jaguar) as well as MacOS 9. Second, it introduces a new file format, SITX, which allows for considerably greater compression, though SITX files can only be opened with StuffIt version 7 and above.