ComponentSearch is my favorite way to do this.

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hongping Lim
Sent: Monday, April 23, 2007 4:19 PM
To: wix-users@lists.sourceforge.net
Subject: [WiX-users] how to detect if another product is installed

Hi,

I have a product A that requires another product B to be installed. B by itself 
does not write to any registry keys, but I have the strings for its Product Id 
and UpgradeCode.

Is there any way for the installer A to detect whether product B is present?

Thanks,
Hongping
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