Index: /trunk/src/VBox/Additions/WINNT/Installer/VBoxGuestAdditions.nsi
===================================================================
--- /trunk/src/VBox/Additions/WINNT/Installer/VBoxGuestAdditions.nsi	(revision 35832)
+++ /trunk/src/VBox/Additions/WINNT/Installer/VBoxGuestAdditions.nsi	(revision 35833)
@@ -620,5 +620,9 @@
     DetailPrint "No previous version of ${PRODUCT_NAME} detected."
   ${EndIf}
-  DetailPrint "Detected OS: Windows $g_strWinVersion"
+!if $%BUILD_TARGET_ARCH% == "amd64"
+  DetailPrint "Detected OS: Windows $g_strWinVersion (64-bit)"
+!else
+  DetailPrint "Detected OS: Windows $g_strWinVersion (32-bit)"
+!endif
   DetailPrint "System Directory: $g_strSystemDir"