diff --git a/NAPS2.Lib/Config/Naps2Config.cs b/NAPS2.Lib/Config/Naps2Config.cs
index 73cfae19cd..8722961635 100644
--- a/NAPS2.Lib/Config/Naps2Config.cs
+++ b/NAPS2.Lib/Config/Naps2Config.cs
@@ -25,7 +25,7 @@ public static Naps2Config Stub() =>
             ConfigScope.Memory<CommonConfig>(),
             ConfigScope.Defaults(InternalDefaults.GetCommonConfig()));
 
-    public Naps2Config(string appConfigPath, string userConfigPath)
+    public Naps2Config(string appConfigPath, string userConfigPath, string? userConfigName = null)
     {
         AppLocked = ConfigScope.File(appConfigPath,
             new ConfigSerializer(ConfigReadMode.LockedOnly, ConfigRootName.AppConfig),
@@ -33,12 +33,14 @@ public Naps2Config(string appConfigPath, string userConfigPath)
         Run = ConfigScope.Memory<CommonConfig>();
         User = ConfigScope.File(userConfigPath, new ConfigSerializer(ConfigReadMode.All, ConfigRootName.UserConfig),
             ConfigScopeMode.ReadWrite);
+        UserConfigName = userConfigName;
         AppDefault = ConfigScope.File(appConfigPath,
             new ConfigSerializer(ConfigReadMode.DefaultOnly, ConfigRootName.AppConfig),
             ConfigScopeMode.ReadOnly);
         InternalDefault = ConfigScope.Defaults(InternalDefaults.GetCommonConfig());
 
         Scopes = new[] { AppLocked, Run, User, AppDefault, InternalDefault };
+        UserConfigName = userConfigName;
     }
 
     public Naps2Config(ConfigScope<CommonConfig> appLocked, ConfigScope<CommonConfig> run,
@@ -87,4 +89,6 @@ public Naps2Config WithTransaction(params TransactionConfigScope<CommonConfig>[]
     public ConfigScope<CommonConfig> User { get; }
     public ConfigScope<CommonConfig> AppDefault { get; }
     public ConfigScope<CommonConfig> InternalDefault { get; }
+
+    public string? UserConfigName { get; }
 }
\ No newline at end of file
diff --git a/NAPS2.Lib/EtoForms/Ui/DesktopForm.cs b/NAPS2.Lib/EtoForms/Ui/DesktopForm.cs
index 1ad1a5a578..e3f6359aac 100644
--- a/NAPS2.Lib/EtoForms/Ui/DesktopForm.cs
+++ b/NAPS2.Lib/EtoForms/Ui/DesktopForm.cs
@@ -575,6 +575,8 @@ public void EditWithAppChanged()
     protected virtual void UpdateTitle(ScanProfile? defaultProfile)
     {
         Title = string.Format(UiStrings.Naps2TitleFormat, defaultProfile?.DisplayName ?? UiStrings.Naps2FullName);
+        if (Config.UserConfigName != null)
+            Title += " (" + Config.UserConfigName + ")";
     }
 
     private void ListViewMouseWheel(object? sender, MouseEventArgs e)
diff --git a/NAPS2.Lib/Modules/CommonModule.cs b/NAPS2.Lib/Modules/CommonModule.cs
index 91af8e51ac..787179ae37 100644
--- a/NAPS2.Lib/Modules/CommonModule.cs
+++ b/NAPS2.Lib/Modules/CommonModule.cs
@@ -39,9 +39,30 @@ protected override void Load(ContainerBuilder builder)
         builder.RegisterType<WorkerScanBridge>().AsSelf();
 
         // Config
+        string configFileName = "config";
+        string? configName = null;  // Default: standard config file
+        // Config file suffix specified via command line argument?
+        string? configFileOption = Environment.GetCommandLineArgs()
+                                             .FirstOrDefault(s => s.ToLower().StartsWith("/config="));
+        if (configFileOption != null)
+        {
+            configName = configFileOption.Substring("/config=".Length).Trim();
+            if (configName == "")
+                configName = null;
+            else
+            {
+                if (Path.GetInvalidFileNameChars().Any(configName.Contains))
+                    configName = null;
+                else
+                    configFileName += "_" + configName;
+            }
+        }
+        configFileName += ".xml";
+
         // TODO: Make this a usable path on Mac/Linux
         var config = new Naps2Config(Path.Combine(Paths.Executable, "appsettings.xml"),
-            Path.Combine(Paths.AppData, "config.xml"));
+            Path.Combine(Paths.AppData, configFileName), 
+            configName);   // Remember optional config name
         builder.RegisterInstance(config);
         builder.RegisterBuildCallback(ctx =>
         {