--- a/Tools/UIPreviewer.py	Fri Jan 08 19:14:19 2010 +0000
+++ b/Tools/UIPreviewer.py	Sat Jan 09 19:43:36 2010 +0000
@@ -426,7 +426,7 @@
         filters = ""
         formats = QImageWriter.supportedImageFormats()
         for format in formats:
-            filters = "%s*.%s " % (filters, str(format).lower())
+            filters = "%s*.%s " % (filters, bytes(format).decode().lower())
         filter = self.trUtf8("Images ({0})").format(filters[:-1])
         
         fname = QFileDialog.getSaveFileName(\