diff --git a/contrib/packaging/wix/mercurial.wxs b/contrib/packaging/wix/mercurial.wxs
--- a/contrib/packaging/wix/mercurial.wxs
+++ b/contrib/packaging/wix/mercurial.wxs
@@ -39,7 +39,8 @@
 
     <Property Id="INSTALLDIR">
       <ComponentSearch Id='SearchForMainExecutableComponent'
-                       Guid='$(var.ComponentMainExecutableGUID)' />
+                       Guid='$(var.ComponentMainExecutableGUID)'
+                       Type='directory' />
     </Property>
 
     <!--Property Id='ARPCOMMENTS'>any comments</Property-->