diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index ac65b841b50..052b141e659 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -914,7 +914,7 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 				return extHostTask.registerTaskProvider(extension, type, provider);
 			},
 			registerFileSystemProvider(scheme, provider, options) {
-				return extHostFileSystem.registerFileSystemProvider(extension.identifier, scheme, provider, options);
+				return extHostFileSystem.registerFileSystemProvider(extension, scheme, provider, options);
 			},
 			get fs() {
 				return extHostConsumerFileSystem.value;
diff --git a/src/vs/workbench/api/common/extHostFileSystem.ts b/src/vs/workbench/api/common/extHostFileSystem.ts
index f759e84dc31..f66041d6c8e 100644
--- a/src/vs/workbench/api/common/extHostFileSystem.ts
+++ b/src/vs/workbench/api/common/extHostFileSystem.ts
@@ -15,7 +15,8 @@ import { State, StateMachine, LinkComputer, Edge } from 'vs/editor/common/modes/
 import { commonPrefixLength } from 'vs/base/common/strings';
 import { CharCode } from 'vs/base/common/charCode';
 import { VSBuffer } from 'vs/base/common/buffer';
-import { ExtensionIdentifier } from 'vs/platform/extensions/common/extensions';
+import { IExtensionDescription } from 'vs/platform/extensions/common/extensions';
+import { checkProposedApiEnabled } from 'vs/workbench/services/extensions/common/extensions';
 
 class FsLinkProvider {
 
@@ -133,7 +134,7 @@ export class ExtHostFileSystem implements ExtHostFileSystemShape {
 		}
 	}
 
-	registerFileSystemProvider(extension: ExtensionIdentifier, scheme: string, provider: vscode.FileSystemProvider, options: { isCaseSensitive?: boolean, isReadonly?: boolean } = {}) {
+	registerFileSystemProvider(extension: IExtensionDescription, scheme: string, provider: vscode.FileSystemProvider, options: { isCaseSensitive?: boolean, isReadonly?: boolean } = {}) {
 
 		if (this._registeredSchemes.has(scheme)) {
 			throw new Error(`a provider for the scheme '${scheme}' is already registered`);
@@ -160,11 +161,12 @@ export class ExtHostFileSystem implements ExtHostFileSystemShape {
 		if (typeof provider.open === 'function' && typeof provider.close === 'function'
 			&& typeof provider.read === 'function' && typeof provider.write === 'function'
 		) {
+			checkProposedApiEnabled(extension, 'fsChunks');
 			capabilities += files.FileSystemProviderCapabilities.FileOpenReadWriteClose;
 		}
 
 		this._proxy.$registerFileSystemProvider(handle, scheme, capabilities).catch(err => {
-			console.error(`FAILED to register filesystem provider of ${extension.value}-extension for the scheme ${scheme}`);
+			console.error(`FAILED to register filesystem provider of ${extension.identifier.value}-extension for the scheme ${scheme}`);
 			console.error(err);
 		});
 
diff --git a/src/vs/workbench/services/extensions/common/extensionsApiProposals.ts b/src/vs/workbench/services/extensions/common/extensionsApiProposals.ts
index 7e4703820a1..801927b4506 100644
--- a/src/vs/workbench/services/extensions/common/extensionsApiProposals.ts
+++ b/src/vs/workbench/services/extensions/common/extensionsApiProposals.ts
@@ -7,6 +7,7 @@
 
 export const allApiProposals = Object.freeze({
 	editorInsets: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.editorInsets.d.ts',
+	fsChunks: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.fsChunks.d.ts',
 	languageStatus: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.languageStatus.d.ts'
 });
 export type ApiProposalName = keyof typeof allApiProposals;
diff --git a/src/vscode-dts/vscode.proposed.d.ts b/src/vscode-dts/vscode.proposed.d.ts
index 6e5bb2824d0..8c8510cfa24 100644
--- a/src/vscode-dts/vscode.proposed.d.ts
+++ b/src/vscode-dts/vscode.proposed.d.ts
@@ -267,19 +267,6 @@ declare module 'vscode' {
 
 	//#endregion
 
-
-
-	//#region fsChunks: https://github.com/microsoft/vscode/issues/84515
-
-	export interface FileSystemProvider {
-		open?(resource: Uri, options: { create: boolean; }): number | Thenable<number>;
-		close?(fd: number): void | Thenable<void>;
-		read?(fd: number, pos: number, data: Uint8Array, offset: number, length: number): number | Thenable<number>;
-		write?(fd: number, pos: number, data: Uint8Array, offset: number, length: number): number | Thenable<number>;
-	}
-
-	//#endregion
-
 	//#region textSearchProvider: https://github.com/microsoft/vscode/issues/59921
 
 	/**
diff --git a/src/vscode-dts/vscode.proposed.fsChunks.d.ts b/src/vscode-dts/vscode.proposed.fsChunks.d.ts
new file mode 100644
index 00000000000..fe582949348
--- /dev/null
+++ b/src/vscode-dts/vscode.proposed.fsChunks.d.ts
@@ -0,0 +1,16 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+declare module 'vscode' {
+
+	// https://github.com/microsoft/vscode/issues/84515
+
+	export interface FileSystemProvider {
+		open?(resource: Uri, options: { create: boolean; }): number | Thenable<number>;
+		close?(fd: number): void | Thenable<void>;
+		read?(fd: number, pos: number, data: Uint8Array, offset: number, length: number): number | Thenable<number>;
+		write?(fd: number, pos: number, data: Uint8Array, offset: number, length: number): number | Thenable<number>;
+	}
+}