Is the Archive Utility in MAC OS X Leopard a compression and extraction application?
Yes, it is an application with no gui. You do need commercial software as this is included with OS X. It has some limitations in terms of what formats it can uncompress (such as .rar files and also password protected file). From Wikipedia: “Archive Utility (BOMArchiveHelper until Mac OS X 10.5) is the default archive file handler in Mac OS X. It is a service application that has no GUI other than setting preferences when double-clicked, rather it is invoked by double-clicking one of its supported file formats. It can be used to create compressed archives by choosing “Create archive of ‘file'” (Leopard: “Compress”) in the Finder’s File or contextual menu.” It supports these formats: * bom (.bom) [1] * bzip2 (.bz, .bz2) * cpgz (cpio gziped) * cpio (.cpio) * gz (.gzip, .gz) * tar (.tar) * tgz (tar gziped) * tbz, tbz2 (tar bziped) * compress (.Z) * UUencode * ZIP (.