diff --git a/package.json b/package.json
index b01b7011f..42492c1f1 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,8 @@
 		"contribCommentEditorActionsMenu",
 		"shareProvider",
 		"quickDiffProvider",
-		"quickPickItemIcon"
+		"quickPickItemIcon",
+		"readonlyMessage"
 	],
 	"version": "0.66.0",
 	"publisher": "GitHub",
@@ -949,6 +950,11 @@
 				"category": "%command.pull.request.category%",
 				"icon": "$(comment)"
 			},
+			{
+				"command": "pr.checkoutFromReadonlyFile",
+				"title": "%command.pr.pick.title%",
+				"category": "%command.pull.request.category%"
+			},
 			{
 				"command": "review.diffWithPrHead",
 				"title": "%command.review.diffWithPrHead.title%",
@@ -2349,7 +2355,7 @@
 		"@types/react-dom": "^16.8.2",
 		"@types/sinon": "7.0.11",
 		"@types/temp": "0.8.34",
-		"@types/vscode": "1.69.0",
+		"@types/vscode": "1.79.0",
 		"@types/webpack-env": "^1.16.0",
 		"@typescript-eslint/eslint-plugin": "4.18.0",
 		"@typescript-eslint/parser": "4.18.0",
diff --git a/src/@types/vscode.proposed.readonlyMessage.d.ts b/src/@types/vscode.proposed.readonlyMessage.d.ts
new file mode 100644
index 000000000..19befbb81
--- /dev/null
+++ b/src/@types/vscode.proposed.readonlyMessage.d.ts
@@ -0,0 +1,14 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+// https://github.com/microsoft/vscode/issues/166971
+
+declare module 'vscode' {
+
+	export namespace workspace {
+
+		export function registerFileSystemProvider(scheme: string, provider: FileSystemProvider, options?: { readonly isCaseSensitive?: boolean; readonly isReadonly?: boolean | MarkdownString }): Disposable;
+	}
+}
diff --git a/src/commands.ts b/src/commands.ts
index 6b72e5506..5f90d952d 100644
--- a/src/commands.ts
+++ b/src/commands.ts
@@ -13,7 +13,7 @@ import { IComment } from './common/comment';
 import Logger from './common/logger';
 import { FILE_LIST_LAYOUT, PR_SETTINGS_NAMESPACE } from './common/settingKeys';
 import { ITelemetry } from './common/telemetry';
-import { asTempStorageURI, fromReviewUri, Schemes, toPRUri } from './common/uri';
+import { asTempStorageURI, fromPRUri, fromReviewUri, Schemes, toPRUri } from './common/uri';
 import { formatError } from './common/utils';
 import { EXTENSION_ID } from './constants';
 import { FolderRepositoryManager } from './github/folderRepositoryManager';
@@ -511,6 +511,29 @@ export function registerCommands(
 		}),
 	);
 
+	context.subscriptions.push(vscode.commands.registerCommand('pr.checkoutFromReadonlyFile', async () => {
+		const uri = vscode.window.activeTextEditor?.document.uri;
+		if (uri?.scheme !== Schemes.Pr) {
+			return;
+		}
+		const prUriPropserties = fromPRUri(uri);
+		if (prUriPropserties === undefined) {
+			return;
+		}
+		let githubRepository: GitHubRepository | undefined;
+		const folderManager = reposManager.folderManagers.find(folderManager => {
+			githubRepository = folderManager.gitHubRepositories.find(githubRepo => githubRepo.remote.remoteName === prUriPropserties.remoteName);
+			return !!githubRepository;
+		});
+		if (!folderManager || !githubRepository) {
+			return;
+		}
+		const prModel = await folderManager.fetchById(githubRepository, Number(prUriPropserties.prNumber));
+		if (prModel) {
+			return ReviewManager.getReviewManagerForFolderManager(reviewsManager.reviewManagers, folderManager)?.switch(prModel);
+		}
+	}));
+
 	context.subscriptions.push(
 		vscode.commands.registerCommand('pr.pickOnVscodeDev', async (pr: PRNode | DescriptionNode | PullRequestModel) => {
 			if (pr === undefined) {
diff --git a/src/extension.ts b/src/extension.ts
index 82ec90cdb..a47a1b003 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -368,7 +368,9 @@ async function deferredActivate(context: vscode.ExtensionContext, apiImpl: GitAp
 	const reposManager = new RepositoriesManager(folderManagers, credentialStore, telemetry);
 	context.subscriptions.push(reposManager);
 	const inMemPRFileSystemProvider = getInMemPRFileSystemProvider({ reposManager, gitAPI: apiImpl, credentialStore })!;
-	context.subscriptions.push(vscode.workspace.registerFileSystemProvider(Schemes.Pr, inMemPRFileSystemProvider, { isReadonly: true }));
+	const readOnlyMessage = new vscode.MarkdownString(vscode.l10n.t('Cannot edit this pull request file. [Check out](command:pr.checkoutFromReadonlyFile) this pull request to edit.'));
+	readOnlyMessage.isTrusted = { enabledCommands: ['pr.checkoutFromReadonlyFile'] };
+	context.subscriptions.push(vscode.workspace.registerFileSystemProvider(Schemes.Pr, inMemPRFileSystemProvider, { isReadonly: readOnlyMessage }));
 
 	await init(context, apiImpl, credentialStore, repositories, prTree, liveshareApiPromise, showPRController, reposManager);
 }
diff --git a/yarn.lock b/yarn.lock
index f9a4aa9d4..67c22127a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -618,10 +618,10 @@
   dependencies:
     "@types/node" "*"
 
-"@types/vscode@1.69.0":
-  version "1.69.0"
-  resolved "https://registry.yarnpkg.com/@types/vscode/-/vscode-1.69.0.tgz#a472011af392fbcf82cbb82f60b4c239c21b921c"
-  integrity sha512-RlzDAnGqUoo9wS6d4tthNyAdZLxOIddLiX3djMoWk29jFfSA1yJbIwr0epBYqqYarWB6s2Z+4VaZCQ80Jaa3kA==
+"@types/vscode@1.79.0":
+  version "1.79.0"
+  resolved "https://registry.yarnpkg.com/@types/vscode/-/vscode-1.79.0.tgz#e2aed1bb3946ae2bebbc3b88020d0efe18f941a9"
+  integrity sha512-Tfowu2rSW8hVGbqzQLSPlOEiIOYYryTkgJ+chMecpYiJcnw9n0essvSiclnK+Qh/TcSVJHgaK4EMrQDZjZJ/Sw==
 
 "@types/webpack-env@^1.16.0":
   version "1.16.2"