diff --git a/src/ui/Logic/FileTypeAssociations.cs b/src/ui/Logic/FileTypeAssociations.cs
index 4e3431e74..34dbde3a8 100644
--- a/src/ui/Logic/FileTypeAssociations.cs
+++ b/src/ui/Logic/FileTypeAssociations.cs
@@ -97,13 +97,25 @@ namespace Nikse.SubtitleEdit.Logic
 
         internal static void DeleteFileAssociationViaRegistry(string ext, string appName)
         {
+            var appExtensionRegKey = $"{appName}{ext}";
             using (var registryKey = Registry.CurrentUser.OpenSubKey(@"Software\Classes\", true))
             {
-                if (registryKey?.OpenSubKey($"{appName}{ext}") != null)
+                if (registryKey?.OpenSubKey(appExtensionRegKey) != null)
                 {
                     registryKey.DeleteSubKeyTree($"{appName}{ext}");
                 }
             }
+
+            // (Default)
+            const string defaultRegValueName = "";
+            using (var registryKey = Registry.CurrentUser.OpenSubKey("Software\\Classes\\" + ext, true))
+            {
+                var registryValue = registryKey?.GetValue(defaultRegValueName);
+                if (appExtensionRegKey.Equals((string)registryValue, StringComparison.Ordinal))
+                {
+                    registryKey.DeleteValue(defaultRegValueName);
+                }
+            }
         }
 
         internal static void Refresh()
@@ -112,4 +124,4 @@ namespace Nikse.SubtitleEdit.Logic
             SHChangeNotify(0x08000000, 0x2000, IntPtr.Zero, IntPtr.Zero);
         }
     }
-}
+}
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