Viewing native files from programs such as Photoshop or Illustrator can be difficult if you don't own the often very expensive packages. Google has recently added a useful functionality to Google Drive — the ability to accurately preview a number of exotic formats, including psd, ai, ttf and dxf. You won't be able to edit said files, but at least you will know what they contain. Users do not need to join Google apps (though doing so is a good idea) but can just go here to view immediately in-browser.
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