diff --git a/src/vs/workbench/contrib/interactive/browser/interactive.contribution.ts b/src/vs/workbench/contrib/interactive/browser/interactive.contribution.ts
index 86bf90f9304..da64485f909 100644
--- a/src/vs/workbench/contrib/interactive/browser/interactive.contribution.ts
+++ b/src/vs/workbench/contrib/interactive/browser/interactive.contribution.ts
@@ -89,15 +89,12 @@ export class InteractiveDocumentContribution extends Disposable implements IWork
 		const info = notebookService.getContributedNotebookType('interactive');
 
 		// We need to contribute a notebook type for the Interactive Window to provide notebook models.
-		// Don't add a file selector for the notebook type to avoid having the notebook Service create an editor for it.
-		// The IW editor is registered below, and we don't want it overwritten by the notebook Service.
 		if (!info) {
 			this._register(notebookService.registerContributedNotebookType('interactive', {
 				providerDisplayName: 'Interactive Notebook',
 				displayName: 'Interactive',
 				filenamePattern: ['*.interactive'],
-				exclusive: true,
-				externalEditor: true
+				exclusive: true
 			}));
 		}
 
diff --git a/src/vs/workbench/contrib/notebook/browser/services/notebookServiceImpl.ts b/src/vs/workbench/contrib/notebook/browser/services/notebookServiceImpl.ts
index 6afedbfff8e..0c82eb7cb7f 100644
--- a/src/vs/workbench/contrib/notebook/browser/services/notebookServiceImpl.ts
+++ b/src/vs/workbench/contrib/notebook/browser/services/notebookServiceImpl.ts
@@ -279,8 +279,9 @@ export class NotebookProviderInfoStore extends Disposable {
 		}
 		this._contributedEditors.set(info.id, info);
 		let editorRegistration: IDisposable | undefined;
-		// Don't overwrite editor contributions if they come from elsewhere
-		if (!info.externalEditor) {
+
+		// built-in notebook providers contribute their own editors
+		if (info.extension) {
 			editorRegistration = this._registerContributionPoint(info);
 			this._contributedEditorDisposables.add(editorRegistration);
 		}
@@ -640,8 +641,7 @@ export class NotebookService extends Disposable implements INotebookService {
 			providerDisplayName: data.providerDisplayName,
 			exclusive: data.exclusive,
 			priority: RegisteredEditorPriority.default,
-			selectors: [],
-			externalEditor: !!data.externalEditor
+			selectors: []
 		});
 
 		info.update({ selectors: data.filenamePattern });
diff --git a/src/vs/workbench/contrib/notebook/common/notebookCommon.ts b/src/vs/workbench/contrib/notebook/common/notebookCommon.ts
index f9df8c3c694..e57bc24b374 100644
--- a/src/vs/workbench/contrib/notebook/common/notebookCommon.ts
+++ b/src/vs/workbench/contrib/notebook/common/notebookCommon.ts
@@ -533,8 +533,6 @@ export interface INotebookContributionData {
 	displayName: string;
 	filenamePattern: (string | glob.IRelativePattern | INotebookExclusiveDocumentFilter)[];
 	exclusive: boolean;
-	/// Editor contribution is handled elswhere e.g. interactive
-	externalEditor?: boolean;
 }
 
 
diff --git a/src/vs/workbench/contrib/notebook/common/notebookProvider.ts b/src/vs/workbench/contrib/notebook/common/notebookProvider.ts
index 8345ef61981..16a9ee3a57b 100644
--- a/src/vs/workbench/contrib/notebook/common/notebookProvider.ts
+++ b/src/vs/workbench/contrib/notebook/common/notebookProvider.ts
@@ -20,7 +20,6 @@ export interface NotebookEditorDescriptor {
 	readonly priority: RegisteredEditorPriority;
 	readonly providerDisplayName: string;
 	readonly exclusive: boolean;
-	readonly externalEditor?: boolean;
 }
 
 export class NotebookProviderInfo {
@@ -31,7 +30,6 @@ export class NotebookProviderInfo {
 	readonly priority: RegisteredEditorPriority;
 	readonly providerDisplayName: string;
 	readonly exclusive: boolean;
-	readonly externalEditor: boolean;
 
 	private _selectors: NotebookSelector[];
 	get selectors() {
@@ -59,7 +57,6 @@ export class NotebookProviderInfo {
 			transientOutputs: false,
 			cellContentMetadata: {}
 		};
-		this.externalEditor = !!descriptor.externalEditor;
 	}
 
 	update(args: { selectors?: NotebookSelector[]; options?: TransientOptions }) {
diff --git a/src/vs/workbench/contrib/notebook/common/notebookService.ts b/src/vs/workbench/contrib/notebook/common/notebookService.ts
index 2024a6fb925..6614adc8fbf 100644
--- a/src/vs/workbench/contrib/notebook/common/notebookService.ts
+++ b/src/vs/workbench/contrib/notebook/common/notebookService.ts
@@ -79,6 +79,7 @@ export interface INotebookService {
 	getNotebookTextModels(): Iterable<NotebookTextModel>;
 	listNotebookDocuments(): readonly NotebookTextModel[];
 
+	/**	Register a notebook type that we will handle. The notebook editor will be registered for notebook types contributed by extensions */
 	registerContributedNotebookType(viewType: string, data: INotebookContributionData): IDisposable;
 	getContributedNotebookType(viewType: string): NotebookProviderInfo | undefined;
 	getContributedNotebookTypes(resource?: URI): readonly NotebookProviderInfo[];
diff --git a/src/vs/workbench/services/extensions/common/extensions.ts b/src/vs/workbench/services/extensions/common/extensions.ts
index 436f780bd00..cb18e8ac6f3 100644
--- a/src/vs/workbench/services/extensions/common/extensions.ts
+++ b/src/vs/workbench/services/extensions/common/extensions.ts
@@ -260,7 +260,8 @@ function extensionDescriptionArrayToMap(extensions: IExtensionDescription[]): Ex
 }
 
 export function isProposedApiEnabled(extension: IExtensionDescription, proposal: ApiProposalName): boolean {
-	if (!extension.enabledApiProposals) {
+	if (!extension.
+		enabledApiProposals) {
 		return false;
 	}
 	return extension.enabledApiProposals.includes(proposal);