If you need a free tool to open zipped files, tar files, or other types of compressed folders, and to likewise zip folders yourself, check out 7 Zip. I've been using it for a month now (after my Power Archiver trial ended), and I've found 7 zip does everything I ever need it to -- and it's free.
Here's their site: http://www.7-zip.org
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I'm a technical writer based in the California San Francisco Bay area. Topics I write about on this blog include technical writing, authoring and publishing tools, API documentation, tech comm trends, visual communication, technical writing career advice, information architecture and findability, developer documentation, and more. If you're a professional or aspiring technical writer, be sure to subscribe to email updates using the form above. You can learn more about me here. You can also contact me with questions.