Multiple Attachment Boxes

I have created a sample form with 3 attachment boxes in, they all add attachments fine, but when I open the first attachment in box 1 that opens fine, but when I try to open the attachment in Box 2 it will only open the attachment in Box 1

Code to Open Attachment is:-

try{

var myDoc = event.target;

var sFile = ListBox1.rawValue;

myDoc.exportDataObject({ cName: sFile, nLaunch: 2 });

catch(e)

Any help would be appreciated