I recently received some .ai files from a design partner and needed a way to view and manipulate the data. My first assumption was that I would need Adobe Illustrator in order to open the proprietary file format. Turns out there are a couple of simple and free options: 1. Rename [filename].ai to [filename].pdf — the file can then be opened with a PDF viewer like Adobe Reader. This is a great option is you just need to view the content. 2. Download the free, open source vector graphics editor Inkscape. Here’s a blurb from the Inkscape website: Inkscape is an open-source vector graphics editor similar to Adobe Illustrator, Corel Draw, Freehand, or Xara X. What sets Inkscape apart is its use of Scalable Vector Graphics (SVG), an open XML-based W3C standard, as the native format. Even though Inkscape uses SVG natively, it can open and manipulate .ai files. You can download it free from Sourceforge. Interested in working with us? Need additional information on our services? Please reach out and let us know how we can help. Source.