Adding attachments on Livecycle designer form guide

This is a pretty deep question. You're going to need to find a LiveCycle Form Guides expert. The Form Guides are actually ActionScript and run in the Flash runtime. There is of course a connection between the Acrobat Enviroment and the Flash, but I don't know if any of it is documented, or well documented. You'll need a way to from the guide to trigger JavaScript execution in Acrobat, which can be used to do the actual file import. There are however several security issues with this that might become a problem, and I doubt this would work in Reader.

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Thom Parker
The source for PDF Scripting Info
[url=http://www.pdfScripting.com]pdfscripting.com[/url]

The Acrobat JavaScript Reference, Use it Early and Often
[url=http://www.adobe.com/devnet/acrobat/javascript.php]http://www.adobe.com/devnet/acrobat/javascript.php[/url]

Then most important JavaScript Development tool in Acrobat
[url=http://www.pdfscripting.com/public/34.cfm#JSIntro][b]The Console Window (Video tutorial)[/b][/url]
[url=http://www.acrobatusers.com/tutorials/2006/javascript_console][b]The Console Window(article)[/b][/url]