Set extensions for Redumper in UI (fixes #521)

CHANGELIST.md

@@ -4,6 +4,7 @@
 - Don't pull comment fields that auto-populate
 - Set best compression levels for log files
 - Be more explicit about .NET 6 limitation
+- Set extensions for Redumper in UI
 
 ### 2.6 (2023-07-14)
 

MPF.Modules/Redumper/Converters.cs

@@ -13,8 +13,18 @@ namespace MPF.Modules.Redumper
         /// <returns>Valid extension (with leading '.'), null on error</returns>
         public static string Extension(MediaType? type)
         {
-            // TODO: Determine what extensions are used for each supported type
-            return ".bin";
+            switch (type)
+            {
+                case MediaType.CDROM:
+                    return ".bin";
+                case MediaType.DVD:
+                case MediaType.HDDVD:
+                case MediaType.BluRay:
+                    return ".iso";
+                case MediaType.NONE:
+                default:
+                    return null;
+            }
         }
 
         #endregion