diff -up UniConvertor-1.1.3/src/app/plugins/Filters/wmfsaver.py.orig UniConvertor-1.1.3/src/app/plugins/Filters/wmfsaver.py
--- UniConvertor-1.1.3/src/app/plugins/Filters/wmfsaver.py.orig	2008-02-11 00:51:40.000000000 +0200
+++ UniConvertor-1.1.3/src/app/plugins/Filters/wmfsaver.py	2009-05-02 14:51:41.000000000 +0300
@@ -457,6 +457,7 @@ class WMFSaver:
 	#end
 
 def save(document, file, filename, options = {}):
+	file = open(filename, 'wb')
 	saver = WMFSaver(file, filename, options)
 	saver.SaveDocument(document)
 	saver.close()