Stuffit Deluxe 7: Compression program adds new file format, better encryption. (Reviews).

StuffIt Deluxe has been shrinking and expanding files on the Mac for more than a decade, which makes it ancient by most digital standards. And as with many old structures, sometimes it's better to start from scratch than to build on an existing foundation. Aladdin Systems has rebuilt StuffIt Deluxe 7 from the ground up, adding a new compression engine. Version 7 also sports a new plug-in architecture that lets Aladdin add new archive formats to the program without changing its code. But your decision to upgrade will depend largely on the type of work you do.

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