Read and write file in binary mode to remove BOM (Byte Order Mark) bytes

openformats/formats/docx.py

@@ -101,7 +101,7 @@ def __init__(self, content):
         os.remove(docx_path)
 
         base_rels_path = '{}/{}'.format(self.__tmp_folder, '_rels/.rels')
-        with io.open(base_rels_path, 'r') as f:
+        with io.open(base_rels_path, 'rb') as f:
             base_rels = f.read()
 
         document_relative_path = next((
@@ -124,7 +124,7 @@ def __init__(self, content):
 
     def get_document(self):
         if self.__document is None:
-            with io.open(self.__document_path, 'r') as f:
+            with io.open(self.__document_path, 'rb') as f:
                 self.__document = f.read()
 
         return self.__document
@@ -137,15 +137,15 @@ def set_document(self, document):
 
     def get_document_rels(self):
         if self.__document_rels is None:
-            with io.open(self.__document_rels_path, 'r') as f:
+            with io.open(self.__document_rels_path, 'rb') as f:
                 self.__document_rels = f.read()
 
         return self.__document_rels
 
     def set_document_rels(self, document_rels):
         self.__document_rels = document_rels
 
-        with io.open(self.__document_rels_path, 'w') as f:
+        with io.open(self.__document_rels_path, 'wb') as f:
             f.write(document_rels)
 
     def compress(self):