diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index fd07204c108..6bfa75c148c 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -5921,6 +5921,18 @@ declare module 'vscode' {
 		 * Changes each time the editor is started.
 		 */
 		export const sessionId: string;
+
+		/**
+		 * Opens an *external* item, e.g. a http(s) or mailto-link, using the
+		 * default application.
+		 *
+		 * *Note* that [`showTextDocument`](#window.showTextDocument) is the right
+		 * way to open a text document inside the editor, not this function.
+		 *
+		 * @param target The uri that should be opened.
+		 * @returns A promise indicating if open was successful.
+		 */
+		export function open(target: Uri): Thenable<boolean>;
 	}
 
 	/**
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 9b492047f9f..e2c6fb84fdc 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -16,25 +16,6 @@
 
 declare module 'vscode' {
 
-	//#region Joh - vscode.open
-
-	export namespace env {
-
-		/**
-		 * Opens an *external* item, e.g. a http(s) or mailto-link, using the
-		 * default application.
-		 *
-		 * *Note* that [`showTextDocument`](#window.showTextDocument) is the right
-		 * way to open a text document inside the editor, not this function.
-		 *
-		 * @param target The uri that should be opened.
-		 * @returns A promise indicating if open was successful.
-		 */
-		export function open(target: Uri): Thenable<boolean>;
-	}
-
-	//#endregion
-
 	//#region Joh - selection range provider
 
 	export class SelectionRangeKind {
diff --git a/src/vs/workbench/api/node/extHost.api.impl.ts b/src/vs/workbench/api/node/extHost.api.impl.ts
index 6f9e14ee77f..249c88fa891 100644
--- a/src/vs/workbench/api/node/extHost.api.impl.ts
+++ b/src/vs/workbench/api/node/extHost.api.impl.ts
@@ -256,9 +256,9 @@ export function createApiFactory(
 			get clipboard(): vscode.Clipboard {
 				return extHostClipboard;
 			},
-			open: proposedApiFunction(extension, (uri: URI) => {
+			open(uri: URI) {
 				return extHostWindow.openUri(uri);
-			})
+			}
 		});
 
 		// namespace: extensions