diff --git a/muk_web_utils/__manifest__.py b/muk_web_utils/__manifest__.py
index 0cdf751..b797103 100644
--- a/muk_web_utils/__manifest__.py
+++ b/muk_web_utils/__manifest__.py
@@ -20,7 +20,7 @@
 { 
     "name": "MuK Web Utils",
     "summary": """Utility Features""",
-    "version": "12.0.2.9.3", 
+    "version": "12.0.2.9.4", 
     "category": "Extra Tools",
     "license": "AGPL-3",
     "author": "MuK IT",
diff --git a/muk_web_utils/controllers/attachment.py b/muk_web_utils/controllers/attachment.py
index 385a789..2dd7a64 100644
--- a/muk_web_utils/controllers/attachment.py
+++ b/muk_web_utils/controllers/attachment.py
@@ -40,6 +40,7 @@ class AttachmentController(http.Controller):
             'type': 'binary',
             'public': False,
             'temporary': tmp,
+            'mimetype': ufile.mimetype if ufile.mimetype and ufile.mimetype != 'application/octet-stream' else None,
         })
         attachment.generate_access_token()
         base_url = request.env['ir.config_parameter'].sudo().get_param('web.base.url')