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How to Down-Save Illustrator File from CS5 to CS4. In this Markzware How-To we look at how you can save an Adobe Illustrator CS5 file for Illustrator CS4 compatibility. It is as easy as a File, Save-As, BUT you must have Adobe Illustrator CS5 in order to down-save for CS4 versions. That is unless you do not use the new Markzware service: Markzware File Conversion Service: http://www.markzware.com Email sales AT markzware DOT com for more info on how Markzware can convert QuarkXPress, InDesign, PDF, Illustrator, Photoshop files or down-save them for you! "Save As CS4" It is not as easy as adding "file.cs4" to the file, no, no! (Adobe Illustrator's file extension is .AI so you need, "file.ai" on all versions of Illustrator artwork files. How to Down-Save Illustrator File from CS5 to CS4