diff --git a/src/Makefile b/src/Makefile
index 0f50e18..62b9f96 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -10,7 +10,8 @@ LIB_MINOR = ${OBJ3DENGINE_LIB_MINOR}
 
 SRCS = O3DEngine.m		\
        O3DGlide3Renderer.m	\
-       O3DRenderer.m
+       O3DRenderer.m		\
+       O3DWinAPIWindow.m
 INCLUDES := ${SRCS:.m=.h}
 
 OBJS_EXTRA = ${EXCEPTIONS_EXCEPTIONS_A}
diff --git a/src/O3DGlide3Renderer.h b/src/O3DGlide3Renderer.h
index 8df131b..e0cbe90 100644
--- a/src/O3DGlide3Renderer.h
+++ b/src/O3DGlide3Renderer.h
@@ -19,9 +19,14 @@
 
 OF_ASSUME_NONNULL_BEGIN
 
+@class O3DWinAPIWindow;
+
 @interface O3DGlide3Renderer: OFObject <O3DRenderer>
 {
 	GrResolution _resolution;
+#ifdef OF_WINDOWS
+	O3DWinAPIWindow *_winAPIWindow;
+#endif
 	GrContext_t _context;
 }
 @end
diff --git a/src/O3DGlide3Renderer.m b/src/O3DGlide3Renderer.m
index 32ab4ed..fb6101e 100644
--- a/src/O3DGlide3Renderer.m
+++ b/src/O3DGlide3Renderer.m
@@ -14,6 +14,7 @@
  */
 
 #import "O3DGlide3Renderer.h"
+#import "O3DWinAPIWindow.h"
 
 static OFSize
 screenResolutionToSize(GrScreenResolution_t resolution)
@@ -214,6 +215,10 @@ floatToScreenRefresh(float refresh)
 
 	grGlideShutdown();
 
+#ifdef OF_WINDOWS
+	[_winAPIWindow release];
+#endif
+
 	[super dealloc];
 }
 
@@ -269,6 +274,9 @@ floatToScreenRefresh(float refresh)
 
 - (void)createWithResolution: (O3DResolution)resolution
 {
+	if (_context != 0)
+		@throw [OFAlreadyOpenException exceptionWithObject: self];
+
 	GrScreenResolution_t screenResolution =
 	    sizeToScreenResolution([resolution.firstObject sizeValue]);
 	GrScreenRefresh_t screenRefresh =
@@ -278,7 +286,14 @@ floatToScreenRefresh(float refresh)
 	    screenRefresh == GR_REFRESH_NONE)
 		@throw [OFInvalidArgumentException exception];
 
-	if ((_context = grSstWinOpen(0, screenRefresh, screenRefresh,
+	FxU32 hWnd = 0;
+#ifdef OF_WINDOWS
+	_winAPIWindow = [[O3DWinAPIWindow alloc]
+	    initWithSize: [resolution.firstObject sizeValue]];
+	hWnd = (FxU32)_winAPIWindow.hWnd;
+#endif
+
+	if ((_context = grSstWinOpen(hWnd, screenRefresh, screenRefresh,
 	    GR_COLORFORMAT_RGBA, GR_ORIGIN_LOWER_LEFT, 2, 1)) == 0)
 		@throw [OFInitializationFailedException
 		    exceptionWithClass: self.class];
diff --git a/src/O3DWinAPIWindow.h b/src/O3DWinAPIWindow.h
new file mode 100644
index 0000000..65b24ce
--- /dev/null
+++ b/src/O3DWinAPIWindow.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2022 Jonathan Schleifer <js@nil.im>
+ *
+ * All rights reserved.
+ *
+ * This file is part of Obj3DEngine. It may be distributed under the terms of
+ * the Q Public License 1.0, which can be found in the file LICENSE.QPL
+ * included in the packaging of this file.
+ *
+ * Alternatively, it may be distributed under the terms of the GNU General
+ * Public License, either version 2 or 3, which can be found in the file
+ * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of
+ * this file.
+ */
+
+#import <ObjFW/ObjFW.h>
+
+#ifdef OF_WINDOWS
+# include <windows.h>
+
+@interface O3DWinAPIWindow: OFObject
+{
+	WNDCLASS _wndClass;
+	HWND _hWnd;
+}
+
+@property (readonly, nonatomic) HWND hWnd;
+
+- (instancetype)initWithSize: (OFSize)size;
+- (instancetype)init OF_UNAVAILABLE;
+@end
+#endif
diff --git a/src/O3DWinAPIWindow.m b/src/O3DWinAPIWindow.m
new file mode 100644
index 0000000..076b65c
--- /dev/null
+++ b/src/O3DWinAPIWindow.m
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2022 Jonathan Schleifer <js@nil.im>
+ *
+ * All rights reserved.
+ *
+ * This file is part of Obj3DEngine. It may be distributed under the terms of
+ * the Q Public License 1.0, which can be found in the file LICENSE.QPL
+ * included in the packaging of this file.
+ *
+ * Alternatively, it may be distributed under the terms of the GNU General
+ * Public License, either version 2 or 3, which can be found in the file
+ * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of
+ * this file.
+ */
+
+#import "O3DWinAPIWindow.h"
+
+#ifdef OF_WINDOWS
+# include <winuser.h>
+
+@implementation O3DWinAPIWindow
+@synthesize hWnd = _hWnd;
+
+- (instancetype)initWithSize: (OFSize)size
+{
+	self = [super init];
+
+	@try {
+		_wndClass = (WNDCLASS){
+			.lpfnWndProc = (WNDPROC)DefWindowProc,
+			.hInstance = GetModuleHandle(NULL),
+			.lpszClassName = "O3DMainWindowClass"
+		};
+
+		if (!RegisterClass(&_wndClass))
+			@throw [OFInitializationFailedException
+			    exceptionWithClass: self.class];
+
+		if ((_hWnd = CreateWindowEx(WS_EX_APPWINDOW,
+		    _wndClass.lpszClassName, "O3DMainWindow", WS_OVERLAPPED,
+		    CW_USEDEFAULT, CW_USEDEFAULT, size.width, size.height,
+		    NULL, NULL, _wndClass.hInstance, NULL)) == NULL)
+			@throw [OFInitializationFailedException
+			    exceptionWithClass: self.class];
+
+		ShowWindow(_hWnd, SW_NORMAL);
+		UpdateWindow(_hWnd);
+	} @catch (id e) {
+		[self release];
+		@throw e;
+	}
+
+	return self;
+}
+
+- (instancetype)init
+{
+	OF_INVALID_INIT_METHOD
+}
+
+- (void)dealloc
+{
+	if (_hWnd != NULL)
+		OFEnsure(DestroyWindow(_hWnd));
+
+	if (_wndClass.lpszClassName != NULL)
+		OFEnsure(UnregisterClass(
+		    _wndClass.lpszClassName, _wndClass.hInstance));
+
+	[super dealloc];
+}
+@end
+#endif
diff --git a/tests/TestsAppDelegate.m b/tests/TestsAppDelegate.m
index 048055a..87fe929 100644
--- a/tests/TestsAppDelegate.m
+++ b/tests/TestsAppDelegate.m
@@ -35,7 +35,7 @@ OF_APPLICATION_DELEGATE(TestsAppDelegate)
 			       engine.renderer.availableResolutions];
 
 	O3DResolution resolution = [OFPair
-	    pairWithFirstObject: [OFValue valueWithSize: OFMakeSize(640, 480)]
+	    pairWithFirstObject: [OFValue valueWithSize: OFMakeSize(800, 600)]
 		   secondObject: [OFNumber numberWithFloat: 60]];
 	[engine.renderer createWithResolution: resolution];