diff --git a/extensions/image-preview/src/extension.ts b/extensions/image-preview/src/extension.ts
index cbb487e094a485c4fb42e0936842f192f7c30db2..cc4eb798cfe5d15cdc0bfda0917ecf12cc3db848 100644
--- a/extensions/image-preview/src/extension.ts
+++ b/extensions/image-preview/src/extension.ts
@@ -23,7 +23,7 @@ export function activate(context: vscode.ExtensionContext) {
 
 	const previewManager = new PreviewManager(extensionRoot, sizeStatusBarEntry, binarySizeStatusBarEntry, zoomStatusBarEntry);
 
-	context.subscriptions.push(vscode.window.registerCustomEditorProvider(PreviewManager.viewType, previewManager));
+	context.subscriptions.push(vscode.window.registerCustomEditorProvider2(PreviewManager.viewType, previewManager));
 
 	context.subscriptions.push(vscode.commands.registerCommand('imagePreview.zoomIn', () => {
 		previewManager.activePreview?.zoomIn();
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 2975b76cfa8a4b12f10498ff2da3796a5347fc8a..12dce38ecc611054eba66229f01b6eacf8ab1588 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1491,6 +1491,19 @@ declare module 'vscode' {
 		readonly editingDelegate?: CustomEditorEditingDelegate<EditType>;
 	}
 
+	namespace window {
+		/**
+		 * Temporary overload for `registerCustomEditorProvider` that takes a `CustomEditorProvider`.
+		 */
+		export function registerCustomEditorProvider2(
+			viewType: string,
+			provider: CustomEditorProvider,
+			options?: {
+				readonly webviewOptions?: WebviewPanelOptions;
+			}
+		): Disposable;
+	}
+
 	// #endregion
 
 	//#region Custom editor move https://github.com/microsoft/vscode/issues/86146
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index bc8a944bb78e2f2f0c4ba1a72d81aa84bbf2718d..054aaa0ad6b4563a8e50bffbf3ce03043156dec7 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -582,7 +582,11 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			registerWebviewPanelSerializer: (viewType: string, serializer: vscode.WebviewPanelSerializer) => {
 				return extHostWebviews.registerWebviewPanelSerializer(extension, viewType, serializer);
 			},
-			registerCustomEditorProvider: (viewType: string, provider: vscode.CustomEditorProvider | vscode.CustomTextEditorProvider, options?: { webviewOptions?: vscode.WebviewPanelOptions }) => {
+			registerCustomEditorProvider: (viewType: string, provider: vscode.CustomTextEditorProvider, options?: { webviewOptions?: vscode.WebviewPanelOptions }) => {
+				return extHostWebviews.registerCustomEditorProvider(extension, viewType, provider, options?.webviewOptions);
+			},
+			registerCustomEditorProvider2: (viewType: string, provider: vscode.CustomEditorProvider, options?: { webviewOptions?: vscode.WebviewPanelOptions }) => {
+				checkProposedApiEnabled(extension);
 				return extHostWebviews.registerCustomEditorProvider(extension, viewType, provider, options?.webviewOptions);
 			},
 			registerDecorationProvider(provider: vscode.DecorationProvider) {