diff --git a/src/vs/platform/extensionManagement/common/extensionManagement.ts b/src/vs/platform/extensionManagement/common/extensionManagement.ts
index 2d6713d409d..ba8a8e86fee 100644
--- a/src/vs/platform/extensionManagement/common/extensionManagement.ts
+++ b/src/vs/platform/extensionManagement/common/extensionManagement.ts
@@ -12,7 +12,7 @@ import { Platform } from '../../../base/common/platform.js';
 import { URI } from '../../../base/common/uri.js';
 import { localize2 } from '../../../nls.js';
 import { ExtensionType, IExtension, IExtensionManifest, TargetPlatform } from '../../extensions/common/extensions.js';
-import { IFileService } from '../../files/common/files.js';
+import { FileOperationError, FileOperationResult, IFileService, IFileStat } from '../../files/common/files.js';
 import { createDecorator } from '../../instantiation/common/instantiation.js';
 
 export const EXTENSION_IDENTIFIER_PATTERN = '^([a-z0-9A-Z][a-z0-9-A-Z]*)\\.([a-z0-9A-Z][a-z0-9-A-Z]*)$';
@@ -640,7 +640,15 @@ export interface IAllowedExtensionsService {
 }
 
 export async function computeSize(location: URI, fileService: IFileService): Promise<number> {
-	const stat = await fileService.resolve(location);
+	let stat: IFileStat;
+	try {
+		stat = await fileService.resolve(location);
+	} catch (e) {
+		if ((<FileOperationError>e).fileOperationResult === FileOperationResult.FILE_NOT_FOUND) {
+			return 0;
+		}
+		throw e;
+	}
 	if (stat.children) {
 		const sizes = await Promise.all(stat.children.map(c => computeSize(c.resource, fileService)));
 		return sizes.reduce((r, s) => r + s, 0);
diff --git a/src/vs/workbench/contrib/extensions/browser/extensionEditor.ts b/src/vs/workbench/contrib/extensions/browser/extensionEditor.ts
index d5d8e0b3cd6..a47806e80f4 100644
--- a/src/vs/workbench/contrib/extensions/browser/extensionEditor.ts
+++ b/src/vs/workbench/contrib/extensions/browser/extensionEditor.ts
@@ -1157,12 +1157,14 @@ class AdditionalDetailsWidget extends Disposable {
 				$('div.more-info-entry-name', undefined, localize('id', "Identifier")),
 				$('code', undefined, extension.identifier.id)
 			));
-		append(installInfo,
-			$('.more-info-entry', undefined,
-				$('div.more-info-entry-name', undefined, localize('Version', "Version")),
-				$('code', undefined, extension.manifest.version)
-			)
-		);
+		if (extension.type !== ExtensionType.System) {
+			append(installInfo,
+				$('.more-info-entry', undefined,
+					$('div.more-info-entry-name', undefined, localize('Version', "Version")),
+					$('code', undefined, extension.manifest.version)
+				)
+			);
+		}
 		if (extension.installedTimestamp) {
 			append(installInfo,
 				$('.more-info-entry', undefined,
@@ -1171,7 +1173,7 @@ class AdditionalDetailsWidget extends Disposable {
 				)
 			);
 		}
-		if (extension.source !== 'gallery') {
+		if (!extension.isBuiltin && extension.source !== 'gallery') {
 			const element = $('div', undefined, extension.source === 'vsix' ? localize('vsix', "VSIX") : localize('other', "Local"));
 			append(installInfo,
 				$('.more-info-entry', undefined,