Remove path from PS1/PS2 serial (fixes #481)

CHANGELIST.md

@@ -26,6 +26,7 @@
 - Comment out `.` handling for DIC
 - Ensure dumping program box can enable/disable
 - Disable special SmartE handling for DIC
+- Remove path from PS1/PS2 serial
 
 ### 2.5 (2023-03-12)
 

MPF.Modules/BaseParameters.cs

@@ -1271,6 +1271,9 @@ namespace MPF.Modules
                     serial = exeName
                         .Replace('_', '-')
                         .Replace(".", string.Empty);
+
+                    // Some games may have the EXE in a subfolder
+                    serial = Path.GetFileName(serial);
                 }
             }