perhaps this helps: http://wix.sourceforge.net/manual-wix2/preprocessor.htm 

to define $(var.myValue) simply write
<?define myValue  = "3"?>

-----Original Message-----
From: Bill McCormick (LIST) [mailto:wpmccorm...@ace-co.com] 
Sent: Montag, 29. März 2010 19:01
To: WiX
Subject: [WiX-users] how to set var's

I've used heat to generate a number of wxs files that contain Fragments 
for different features I'd like to have installed. In following various 
examples the Source property ends up taking the form 
Source="$(var.foo)\bar.ext". I had assumed that, at some point, I would 
learn how to set these various var.foo properties to a real path but the 
only thing that I'm finding is that these var.foo variables are 
references to Wix project References. So is there some way to manually 
set these var's other than through project references?

Thanks,

Bill

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Try the new software tools for yourself. Speed compiling, find bugs
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See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev
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