Issue 4575 - Fix failing tests in buildtools

packagerEdge.py

Index: packagerEdge.py
===================================================================
--- a/packagerEdge.py
+++ b/packagerEdge.py
@@ -112,20 +112,22 @@
 
 def create_content_types_map(filenames):
     """Create [Content_Types].xml -- a mime type map."""
     params = {'defaults': {}, 'overrides': {}}
     overrides = {
         BLOCKMAP: 'application/vnd.ms-appx.blockmap+xml',
         MANIFEST: 'application/vnd.ms-appx.manifest+xml'
     }
+    types = mimetypes.MimeTypes()
+    types.add_type('application/octet-stream', '.otf')
     for filename in filenames:
         ext = os.path.splitext(filename)[1]
         if ext:
-            content_type = mimetypes.guess_type(filename, strict=False)[0]
+            content_type = types.guess_type(filename, strict=False)[0]
             if content_type is not None:
                 params['defaults'][ext[1:]] = content_type
         if filename in overrides:
             params['overrides']['/' + filename] = overrides[filename]
     content_types_template = _get_template_for(CONTENT_TYPES)
     return content_types_template.render(params).encode('utf-8')