diff --git a/src/vs/workbench/api/browser/mainThreadQuickOpen.ts b/src/vs/workbench/api/browser/mainThreadQuickOpen.ts
index 78f8439bf22..30e3d7bca23 100644
--- a/src/vs/workbench/api/browser/mainThreadQuickOpen.ts
+++ b/src/vs/workbench/api/browser/mainThreadQuickOpen.ts
@@ -8,6 +8,7 @@ import { ExtHostContext, MainThreadQuickOpenShape, ExtHostQuickOpenShape, Transf
 import { extHostNamedCustomer } from 'vs/workbench/api/common/extHostCustomers';
 import { URI } from 'vs/base/common/uri';
 import { CancellationToken } from 'vs/base/common/cancellation';
+import { ThemeIcon } from 'vs/platform/theme/common/themeService';
 
 interface QuickInputSession {
 	input: IQuickInput;
@@ -185,14 +186,22 @@ export class MainThreadQuickOpen implements MainThreadQuickOpenShape {
 						return this._quickInputService.backButton;
 					}
 					const { iconPath, tooltip, handle } = button;
-					return {
-						iconPath: iconPath && {
-							dark: URI.revive(iconPath.dark),
-							light: iconPath.light && URI.revive(iconPath.light)
-						},
-						tooltip,
-						handle
-					};
+					if ('id' in iconPath) {
+						return {
+							iconClass: ThemeIcon.asClassName(iconPath),
+							tooltip,
+							handle
+						};
+					} else {
+						return {
+							iconPath: {
+								dark: URI.revive(iconPath.dark),
+								light: iconPath.light && URI.revive(iconPath.light)
+							},
+							tooltip,
+							handle
+						};
+					}
 				});
 			} else {
 				(input as any)[param] = params[param];
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 19564877215..045e8ce561c 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -439,8 +439,10 @@ export interface TransferQuickPickItems extends quickInput.IQuickPickItem {
 	handle: number;
 }
 
-export interface TransferQuickInputButton extends quickInput.IQuickInputButton {
+export interface TransferQuickInputButton {
 	handle: number;
+	iconPath: { dark: URI; light?: URI; } | { id: string; };
+	tooltip?: string;
 }
 
 export type TransferQuickInput = TransferQuickPick | TransferInputBox;
diff --git a/src/vs/workbench/api/common/extHostQuickOpen.ts b/src/vs/workbench/api/common/extHostQuickOpen.ts
index aa41e81b660..fa1aca30a20 100644
--- a/src/vs/workbench/api/common/extHostQuickOpen.ts
+++ b/src/vs/workbench/api/common/extHostQuickOpen.ts
@@ -443,31 +443,21 @@ class ExtHostQuickInput implements QuickInput {
 	}
 }
 
-function getIconUris(iconPath: QuickInputButton['iconPath']): { dark: URI, light?: URI } | undefined {
-	const dark = getDarkIconUri(iconPath);
-	const light = getLightIconUri(iconPath);
-	if (!light && !dark) {
-		return undefined;
+function getIconUris(iconPath: QuickInputButton['iconPath']): { dark: URI, light?: URI } | { id: string } {
+	if (iconPath instanceof ThemeIcon) {
+		return { id: iconPath.id };
 	}
-	return { dark: (dark || light)!, light };
+	const dark = getDarkIconUri(iconPath as any);
+	const light = getLightIconUri(iconPath as any);
+	return { dark, light };
 }
 
-function getLightIconUri(iconPath: QuickInputButton['iconPath']) {
-	if (iconPath && !(iconPath instanceof ThemeIcon)) {
-		if (typeof iconPath === 'string'
-			|| URI.isUri(iconPath)) {
-			return getIconUri(iconPath);
-		}
-		return getIconUri((iconPath as any).light);
-	}
-	return undefined;
+function getLightIconUri(iconPath: string | URI | { light: URI; dark: URI; }) {
+	return getIconUri(typeof iconPath === 'object' && 'light' in iconPath ? iconPath.light : iconPath);
 }
 
-function getDarkIconUri(iconPath: QuickInputButton['iconPath']) {
-	if (iconPath && !(iconPath instanceof ThemeIcon) && (iconPath as any).dark) {
-		return getIconUri((iconPath as any).dark);
-	}
-	return undefined;
+function getDarkIconUri(iconPath: string | URI | { light: URI; dark: URI; }) {
+	return getIconUri(typeof iconPath === 'object' && 'dark' in iconPath ? iconPath.dark : iconPath);
 }
 
 function getIconUri(iconPath: string | URI) {