#1192 Loading up wixproj in VS changes extension paths to absolute

[Kevin Fischer]

Using the install from 3.0.4102.0, if I load up any wixproj file in VS2005, it will change all of the paths to extensions to absolute paths.
e.g.
<wixextension include="$(WixToolPath)WixUIExtension">
becomes
<wixextension include="WixUIExtension">
<hintpath>d:\src\wixcode\bin\WixUIExtension.dll</hintpath>
</wixextension></wixextension>

Since I may be storing the extension files on different drives/locations, I need to use variables to locate them. This new behavior (it didn't happen in older v3 builds) breaks this.

[SourceForge Robot]

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