--- a/FileApplicationNoteBook.st	Tue Nov 18 19:12:59 2014 +0100
+++ b/FileApplicationNoteBook.st	Tue Nov 18 21:58:28 2014 +0100
@@ -544,7 +544,7 @@
                 appl notNil ifTrue:[ ^ appl].
             ].
         ].
-        (anItem fileName mimeTypeOfContents startsWith:'text') ifFalse:[
+        ((anItem fileName mimeTypeOfContents ? '') startsWith:'text') ifFalse:[
             "/ fallback: open a system utility
             OperatingSystem 
                 openApplicationForDocument:anItem fileName 
@@ -7472,10 +7472,10 @@
 !FileApplicationNoteBook class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libtool/FileApplicationNoteBook.st,v 1.307 2014-11-18 14:23:44 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libtool/FileApplicationNoteBook.st,v 1.308 2014-11-18 20:58:28 cg Exp $'
 !
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/libtool/FileApplicationNoteBook.st,v 1.307 2014-11-18 14:23:44 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libtool/FileApplicationNoteBook.st,v 1.308 2014-11-18 20:58:28 cg Exp $'
 ! !