src/vs/workbench/api/common/extHostDialogs.ts/ExtHostDialogs/showOpenDialog
class ExtHostDialogs:	showOpenDialog(options?: vscode.OpenDialogOptions): Promise<URI[] | undefined> {
		return this._proxy.$showOpenDialog(options).then(filepaths => {
			return filepaths ? filepaths.map(p => URI.revive(p)) : undefined;
		});
	}