I don't have an answer for your general question, but as for your Illustrator files: Google Docs recognizes few formats itself, but can handle more if you install 'apps' (found on the Chrome webstore but might be available to other browsers if Docs is 'installing' them to the Google account itself). Since .ai is a proprietary format, it may be hard to find an app that includes it, but perhaps you could export your files in another format, like SVG with extended metadata. Even Google Docs' default "Drawing" utility should open that. Or perhaps someone will suggest another collaborative service that works for you! -Arlo James Barnes
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