diff --git a/muk_utils/__manifest__.py b/muk_utils/__manifest__.py
index e1451cf..29e154b 100644
--- a/muk_utils/__manifest__.py
+++ b/muk_utils/__manifest__.py
@@ -20,7 +20,7 @@
 {
     "name": "MuK Utils",
     "summary": """Utility Features""",
-    "version": '11.0.1.0.9',   
+    "version": '11.0.1.0.10',   
     "category": 'Extra Tools',   
     "license": "AGPL-3",
     "website": "https://www.mukit.at",
diff --git a/muk_utils/tools/utils_os.py b/muk_utils/tools/utils_os.py
index 58a5490..713ab6e 100644
--- a/muk_utils/tools/utils_os.py
+++ b/muk_utils/tools/utils_os.py
@@ -18,7 +18,13 @@
 ###################################################################################
 
 import os
+import io
+import base64
+import shutil
+import urllib
 import logging
+import tempfile
+import mimetypes
 
 _logger = logging.getLogger(__name__)
 
@@ -37,4 +43,15 @@ def unique_name(name, names, escape_suffix=False):
         while name in names:
             suffix += 1
             name = compute_name(name, suffix, escape_suffix)
-        return name
\ No newline at end of file
+        return name
+    
+def get_extension(filename, mimetype):
+    if not mimetype and not filename:
+        mimetype = guess_mimetype(binary, default=False)
+    if not mimetype and filename:
+        mimetype = mimetypes.guess_type(urllib.request.pathname2url(filename))[0]
+    if not filename and mimetype:
+        return mimetypes.guess_extension(mimetype)[1:].strip().lower()
+    elif filename:
+        return os.path.splitext(filename)[1][1:].strip().lower()
+    return None
\ No newline at end of file