diff --git a/src/BizHawk.Client.Common/DisplayManager/SimpleGDIPDisplayManager.cs b/src/BizHawk.Client.Common/DisplayManager/SimpleGDIPDisplayManager.cs
new file mode 100644
index 0000000000..d569e5c974
--- /dev/null
+++ b/src/BizHawk.Client.Common/DisplayManager/SimpleGDIPDisplayManager.cs
@@ -0,0 +1,45 @@
+#nullable enable
+
+using System;
+using System.Drawing;
+
+using BizHawk.Bizware.Graphics;
+using BizHawk.Emulation.Common;
+
+namespace BizHawk.Client.Common
+{
+	public sealed class SimpleGDIPDisplayManager : DisplayManagerBase
+	{
+		private SimpleGDIPDisplayManager(Config config, IEmulator emuCore, IGL_GDIPlus glImpl)
+			: base(
+				config,
+				emuCore,
+				inputManager: null,
+				movieSession: null,
+				EDispMethod.GdiPlus,
+				glImpl,
+				new GDIPlusGuiRenderer(glImpl))
+			{}
+
+		public SimpleGDIPDisplayManager(Config config, IEmulator emuCore, Func<(int Width, int Height)> getVirtualSize)
+			: this(config, emuCore, new IGL_GDIPlus()) {}
+
+		protected override void ActivateGraphicsControlContext() {}
+
+		public override void ActivateOpenGLContext() {}
+
+		protected override int GetGraphicsControlDpi()
+			=> DisplayManagerBase.DEFAULT_DPI;
+
+		protected override Size GetGraphicsControlSize()
+			=> throw new NotImplementedException();
+
+		public override Size GetPanelNativeSize()
+			=> throw new NotImplementedException();
+
+		protected override Point GraphicsControlPointToClient(Point p)
+			=> throw new NotImplementedException();
+
+		protected override void SwapBuffersOfGraphicsControl() {}
+	}
+}
diff --git a/src/BizHawk.Tests.Testroms.GB/DummyFrontend.cs b/src/BizHawk.Tests.Testroms.GB/DummyFrontend.cs
index 6b3182b68b..8cf92f2d37 100644
--- a/src/BizHawk.Tests.Testroms.GB/DummyFrontend.cs
+++ b/src/BizHawk.Tests.Testroms.GB/DummyFrontend.cs
@@ -78,41 +78,6 @@ namespace BizHawk.Tests.Testroms.GB
 				=> throw new NotImplementedException(); // only used by Encore
 		}
 
-		public sealed class SimpleGDIPDisplayManager : DisplayManagerBase
-		{
-			private SimpleGDIPDisplayManager(Config config, IEmulator emuCore, IGL_GDIPlus glImpl)
-				: base(
-					config,
-					emuCore,
-					inputManager: null,
-					movieSession: null,
-					EDispMethod.GdiPlus,
-					glImpl,
-					new GDIPlusGuiRenderer(glImpl))
-				{}
-
-			public SimpleGDIPDisplayManager(Config config, IEmulator emuCore, Func<(int Width, int Height)> getVirtualSize)
-				: this(config, emuCore, new IGL_GDIPlus()) {}
-
-			protected override void ActivateGraphicsControlContext() {}
-
-			public override void ActivateOpenGLContext() {}
-
-			protected override int GetGraphicsControlDpi()
-				=> DisplayManagerBase.DEFAULT_DPI;
-
-			protected override Size GetGraphicsControlSize()
-				=> throw new NotImplementedException();
-
-			public override Size GetPanelNativeSize()
-				=> throw new NotImplementedException();
-
-			protected override Point GraphicsControlPointToClient(Point p)
-				=> throw new NotImplementedException();
-
-			protected override void SwapBuffersOfGraphicsControl() {}
-		}
-
 		private static int _totalFrames = 0;
 
 		private static readonly object _totalFramesMutex = new();