Zipeg is cross-platform software that opens both .rar and .zip files on Mac OS X Leopard, Snow Leopard, and Tiger.

Despite its small size, Zipeg is a powerful utility that can handle various archive formats, including rar, zip, tar, tgz, gzip, bzip2, and iso. Plus, Zipeg lets you choose where to extract and merge files - although the default option is your Desktop - and intelligently manages folder names. You can even select a specific folder from an archive and extract only that folder and its subfolders.
Zipeg is also equipped with features that support multipart rar and zip files (such as file.part1.rar to file.part99.rar) and can handle password-protected files (as long as you have the password). If you need to view photos, Zipeg can launch preview applications, and it can also open other types of documents in their associated programs.
Best of all, Zipeg is completely free and works on both intel and powerpc based Macs, as well as all flavors of Windows. Whether you're using a Mac or a Windows machine, Zipeg is a useful tool that's worth having in your software arsenal.
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