New in v3, and I recently answered a question about this:  see
http://sourceforge.net/mailarchive/message.php?msg_id=36966863.

-- 
Mike Dimmick

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jarl Friis
Sent: 19 October 2006 20:24
To: wix-users@lists.sourceforge.net
Subject: [WiX-users] Undocumented preprocessor features.

I had a look at the source files of the UIExtension, that is, files in
wix\src\ext\UIExtension\wixlib

In Common.wxs I see the following line
<Binary Id="WixUI_Bmp_Banner"
SourceFile="!(wix.WixUIBannerBmp=$(var.bannerBmp))" />

The expression "!(wix.WixUIBannerBmp=$(var.bannerBmp))" seems to be a
preprocessor expression, however it is not clear to me what it means.
In the preprocessor doc (for V2), an exclamation seem not to be explained
there.

Could someone point me to some docs on this, please?


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