Just tell me step by step instructions, I already have the U3 Package Prototyper app.
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The simplest way is to just get PStart U3 and add a shortcut.
If you want to have the link on the Launchpad, look here...
The how-to is here
https://portableapps.com/node/2163#comment-9558
The software which will do the whole thing for you (much easier) is here
http://hypyke.home.comcast.net/U3Shortcut.zip
You will need .net for this to work