Thanks Bob, 
 
A couple of follow up questions:
 
Ok, so if I use "*" as component GUIDs, this means that small updates are out 
of the questions for this approach, right?
 
 > No. If the packages are mutually exclusive, you'll never run into a 
> problem. And even if they did both install on the same machine, it's 
> legal to have the same component in multiple products, as long as the 
> components have identical composition.
 
Ok, so then I won't even bother with the "*". This seems not to be what is 
stated here 
http://blogs.msdn.com/b/heaths/archive/2005/10/24/windows-installer-on-64-bit-platforms.aspx
 in particular thsi section
 

If a 32-bit component is contained in both a 32-bit installation package and a 
64-bit installation package it may have the same component ID but 32- and 
64-bit components should have different component IDs, just as 32- and 64-bit 
products should have different product codes.
 
Or am I reading this wrong?
 
Thanks
Andres
 
 
> Date: Thu, 2 Sep 2010 08:40:48 -0400
> From: b...@joyofsetup.com
> To: wix-users@lists.sourceforge.net
> Subject: Re: [WiX-users] Newbie x64 msi question
> 
> On 30-Aug-10 01:36, Andres Juarez wrote:
> > So, running candle with teh -arch switch does take care of marking the 
> > components at 64 bits, but if using the same Wix source file for the 
> > 32 and 64 bits installer with the only difference of the candle -arh 
> > switch, the Components GUIDS for the 64 and 32 bits installer are all 
> > the same. 
> 
> If you use "*" component guids, they'll be different based on the root 
> directory.
> 
> > The two installers cannot install in the same box since the launch 
> > conditios are mutually exclusive. Do we still need to have unique 
> > GUIDS per components, I am almost sure we do, but just asking.
> 
> No. If the packages are mutually exclusive, you'll never run into a 
> problem. And even if they did both install on the same machine, it's 
> legal to have the same component in multiple products, as long as the 
> components have identical composition.
> 
> -- 
> sig://boB
> http://joyofsetup.com/
> 
> 
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