Issue #15207: Fix mimetypes to read from correct area in Windows registry (Original patch by Dave Chambers)

1 files changed, 17 insertions, 14 deletions

diff --git a/Lib/mimetypes.py b/Lib/mimetypes.py
index 18ade73..3dde4cd 100644
--- a/Lib/mimetypes.py
+++ b/Lib/mimetypes.py
@@ -254,23 +254,26 @@ class MimeTypes:
                 i += 1
 
         default_encoding = sys.getdefaultencoding()
-        with _winreg.OpenKey(_winreg.HKEY_CLASSES_ROOT,
-                             r'MIME\Database\Content Type') as mimedb:
-            for ctype in enum_types(mimedb):
+        with _winreg.OpenKey(_winreg.HKEY_CLASSES_ROOT, '') as hkcr:
+            for subkeyname in enum_types(hkcr):
                 try:
-                    with _winreg.OpenKey(mimedb, ctype) as key:
-                        suffix, datatype = _winreg.QueryValueEx(key,
-                                                                'Extension')
+                    with _winreg.OpenKey(hkcr, subkeyname) as subkey:
+                        # Only check file extensions
+                        if not subkeyname.startswith("."):
+                            continue
+                        # raises EnvironmentError if no 'Content Type' value
+                        mimetype, datatype = _winreg.QueryValueEx(
+                            subkey, 'Content Type')
+                        if datatype != _winreg.REG_SZ:
+                            continue
+                        try:
+                            mimetype = mimetype.encode(default_encoding)
+                            subkeyname = subkeyname.encode(default_encoding)
+                        except UnicodeEncodeError:
+                            continue
+                        self.add_type(mimetype, subkeyname, strict)
                 except EnvironmentError:
                     continue
-                if datatype != _winreg.REG_SZ:
-                    continue
-                try:
-                    suffix = suffix.encode(default_encoding) # omit in 3.x!
-                except UnicodeEncodeError:
-                    continue
-                self.add_type(ctype, suffix, strict)
-
 
 def guess_type(url, strict=True):
     """Guess the type of a file based on its URL.