USB - autorun a web address

I currently have 2 files on it:

autorun.inf
start.url

autorun.inf contains 3 lines:

[autorun]  
ShellExecute=start.url
open=start.url

start.u开发者_开发问答rl contains 5 lines:

[InternetShortcut]
URL=http://cnn.com
IDList=
[{000214A0-0000-0000-C000-000000000046}]
Prop3=19,2

Loads ok on Vista, but does not load on XP or Windows7.

Any clue what to change?

Is the autorun functionality disabled on the XP and Win7 boxes? If so you have to re-enable it.

See this article for how it was, probably, disabled in XP: How to disable the Autorun functionality in Windows

Though I think it could also have been disabled in a group policy.