It's ok, I found a work around here:
http://sourceforge.net/mailarchive/message.php?msg_id=30030043

On Sat, Dec 15, 2012 at 2:33 PM, up2date.cyb...@gmail.com <
up2date.cyb...@gmail.com> wrote:

> Hi, in a bundle, using util:RegistrySearch, is there a way to set a
> default value to a variable?
> What I have now:
> <util:RegistrySearch Variable="MYVAR" Root="HKLM" Key="$(var.RegistryKey)"
> Value="MyValue" Result="value" />
> I want to pass the value to a MSI package with:
> <MsiProperty Name="MYMSIVAR" Value="[MYVAR]" />
>
> If the registry value is not found, the command line of the msi is
> "MYMSIVAR=", so I'd like to:
> -define a default value if registry value doesn't exist
> OR
> -don't set the MsiProperty if the registry value doesn't exist
>
> Can someone help me? or tell me another way
> thanks
>
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