--- a/Win32OperatingSystem.st	Wed Oct 05 17:02:43 2016 +0200
+++ b/Win32OperatingSystem.st	Wed Oct 05 17:21:37 2016 +0200
@@ -4478,7 +4478,7 @@
 
     (in := anExternalInStream) isNil ifTrue:[
         nullStream := Filename nullDevice readWriteStream.
-        in := nullStream.
+        in := nullStream.                                            
     ].
     (out := anExternalOutStream) isNil ifTrue:[
         nullStream isNil ifTrue:[nullStream := Filename nullDevice writeStream].
@@ -4499,7 +4499,7 @@
         fork:true
         newPgrp:true
         inDirectory:dir
-        showWindow:(shellAndArgs at:3).
+        showWindow:(showWindowBooleanOrNil ? (shellAndArgs at:3)).
 
     nullStream notNil ifTrue:[
         nullStream close.