Use IBM PC as default system out of the box

CHANGELIST.md

@@ -107,6 +107,7 @@
 - Simplify output name assembly logic
 - Fix output name null edge case
 - Selectively rebuild program list
+- Use IBM PC as default system out of the box
 
 ### 3.2.4 (2024-11-24)
 

MPF.Frontend/Options.cs

@@ -144,7 +144,7 @@ namespace MPF.Frontend
         {
             get
             {
-                var valueString = GetStringSetting(Settings, "DefaultSystem", null);
+                var valueString = GetStringSetting(Settings, "DefaultSystem", RedumpSystem.IBMPCcompatible.LongName());
                 var valueEnum = Extensions.ToRedumpSystem(valueString ?? string.Empty);
                 return valueEnum;
             }