Added code to register additional non-standard mimetypes

plone/resourceeditor/__init__.py

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+import os.path
+import mimetypes
+
+# Borrowed from zope.contenttype.
+# This allows us to register mimetypes that
+# aren't included in python by default
+#
+# To add additional mimetypes, include a line in mime.types
+
+
+def add_files(filenames):
+    if mimetypes.inited:
+        mimetypes.init(filenames)
+    else:
+        mimetypes.knownfiles.extend(filenames)
+
+
+here = os.path.dirname(os.path.abspath(__file__))
+add_files([os.path.join(here, "mime.types")])

plone/resourceeditor/mime.types

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+text/css				css less