The WiX toolset does exactly that. I thought the warning about specifying
mixed cased GUIDs only shows up in pedantic. The reasoning behind that
pedantic warning is that there were cases where copy and pasting the mixed
case GUIDs between different processes might make them not match (because
the WiX toolset does upper case the GUIDs automatically).

2010/5/9 DEÁK JAHN, Gábor <d...@tramontana.co.hu>

> Rob,
>
> it might have come up earlier (I only found a single reference to it using
> Google but no answer). Is there any theoretical reason for WiX not accepting
> lowercase or mixed case GUIDs? I don't mean passing them on like that, I
> know this is not allowed. But why not simply call ToUpper automatically so
> that authors wouldn't be forced to convert them themselves?
>
> Bye,
>   Gábor
>
> -------------------------------------------------------------------
> Gábor DEÁK JAHN -- Budapest, Hungary
> E-mail: d...@tramontana.co.hu
>
>
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