Just guessing here... Window Vista/7 use a different system font. It's probably causing the issue. So, you can change that in display settings

>Is there any registry configuration in Windows Vista / 7 for messagebox function that make same behavior than in Winsdows XP?
>Try this in command windows in both Windows XP and Windows Vista / 7:
>
>MessageBox("This is a messagebox that make an unwanted word-wrap after this ... (AnotherLongWord) in Windows Vista / 7")
>
>Implement a user defined form for messagebox is not an alternative.
>Reformating messagebox text is hard, but better solution.
>Any other solution, at OS configuration level?