Only take into account processes that have our plugin loaded

installer/installer.gyp

 #
 # Expects command line definition for variable 'target_arch'
 #   Must be either 'ia32' or 'x64'
 #
 # This .gyp file sits in directory 'installer'.
 # When gyp translates files locations, base them here.
 #
 # The solution file from this .gyp source lands in 'installer/build/<(target_arch)'.
 # When gyp does not translate file locations, base them here.
 #
@@ skipping 783 matching lines @@
       'message': 'Compiling WiX source',
       'inputs': 
       [
         'src/installer-lib/test/test-installer-lib.wxs'
       ],
       'outputs':
       [
         '<(build_dir_arch)/test-installer-lib.wixobj'
       ],
       'action':
-        [ 'candle -nologo -dNoDefault ', '-out', '<@(_outputs)', '<@(_inputs)' ]
+        [ 'candle -nologo -arch <(candle_arch) -dNoDefault ', '-out', '<@(_outputs)', '<@(_inputs)' ]
     } ]
   },
 
   #############
   # WiX link for library test MSI
   #############
   {
     'target_name': 'installer-library-test-msi',
     'type': 'none',
     'dependencies':
@@ skipping 75 matching lines @@
         'SubSystem': '1',   # Console
       },
     },
   },
 
   ]
 }