Fixes: #U4-2087

src/Umbraco.Core/Configuration/UmbracoSettings.cs

@@ -670,6 +670,18 @@ namespace Umbraco.Core.Configuration
             }
         }
 
+        /// <summary>
+        /// File types that will not be allowed to be uploaded via the content/media upload control
+        /// </summary>
+	    public static IEnumerable<string> DissallowedUploadFiles
+	    {
+	        get
+	        {
+                var val = GetKey("/settings/content/dissallowedUploadFiles");
+	            return val.Split(new[] {','}, StringSplitOptions.RemoveEmptyEntries);
+	        }
+	    }
+
 		/// <summary>
 		/// Gets the allowed image file types.
 		/// </summary>