You can use the ProductCode property within the MSI. 
http://msdn.microsoft.com/en-gb/library/windows/desktop/aa370854%28v=vs.85%29
.aspx

If by "package" you mean a bootstrapper or something else external to the MSI
then you can open the MSI with InstEd or Orca and examine the Property table
for the same property. 

-----Original Message-----
From: Gary Ewan Park [mailto:ge...@gep13.co.uk] 
Sent: 21 February 2013 07:00
To: wix-users@lists.sourceforge.net
Subject: [WiX-users] Using Product Id="*"

Hello,

I am still quite new to WiX, so please bear with me...

I have implemented the following pattern:

http://wix.sourceforge.net/manual-wix3/major_upgrade.htm

I allow for ease of upgrade.  However, the installation package that I am
trying to create needs to know about the ProductCode, in order to pass a
parameter to the msiexec to make it uninstall the app.  Since I am using
Id=”*”, how can I find out the correct ProductCode (i.e. GUID), in order to
pass as a parameter to msiexec.

Thanks

Gary

Sent from Windows Mail

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