src/vs/workbench/api/browser/mainThreadDialogs.ts/MainThreadDialogs/$showOpenDialog
class MainThreadDialogs:	async $showOpenDialog(options?: MainThreadDialogOpenOptions): Promise<URI[] | undefined> {
		const convertedOptions = MainThreadDialogs._convertOpenOptions(options);
		if (!convertedOptions.defaultUri) {
			convertedOptions.defaultUri = await this._fileDialogService.defaultFilePath();
		}
		return Promise.resolve(this._fileDialogService.showOpenDialog(convertedOptions));
	}