--- a/AbstractOperatingSystem.st	Fri Sep 01 14:02:55 2017 +0200
+++ b/AbstractOperatingSystem.st	Fri Sep 01 14:16:34 2017 +0200
@@ -623,22 +623,22 @@
     "open a windows-shell/mac finder/desktop application to present the document contained in aFilenameOrString.
      This is typically used to present help-files, html documents, pdf documents etc.
      operationSymbol is one of:
-	open
-	edit
-	explore
+        open
+        edit
+        explore
      mimeTypeStringArgOrNil is e.g. 'text/html' or: 'application/pdf'.
      If nil is passed in, the file's suffix is used to guess the mime type.
     "
 
     self
-	openApplicationForDocument:aFilenameOrString
-	operation:operationSymbol
-	mimeType:mimeTypeStringArgOrNil
-	inDirectory:nil
-	ifNone:[
-	    "/ last resort: use a fileBrowser
-	    UserPreferences fileBrowserClass openOn:aFilenameOrString
-	].
+        openApplicationForDocument:aFilenameOrString
+        operation:operationSymbol
+        mimeType:mimeTypeStringArgOrNil
+        inDirectory:nil
+        ifNone:[
+            "/ last resort: use a fileBrowser
+            FileBrowser default openOn:aFilenameOrString
+        ].
 
     "
      self openApplicationForDocument: Filename currentDirectory operation:#open
@@ -649,7 +649,7 @@
     "
 
     "Created: / 29-10-2010 / 12:16:38 / cg"
-    "Modified: / 05-02-2011 / 16:13:42 / cg"
+    "Modified: / 01-09-2017 / 14:03:36 / cg"
 !
 
 openApplicationForDocument:aFilenameOrString operation:operationSymbol mimeType:mimeTypeStringArgOrNil ifNone:exceptionBlock