src/vs/workbench/services/dialogs/electron-sandbox/fileDialogService.ts/FileDialogService/pickFileAndOpen
class FileDialogService:	async pickFileAndOpen(options: IPickAndOpenOptions): Promise<void> {
		const schema = this.getFileSystemSchema(options);

		if (!options.defaultUri) {
			options.defaultUri = await this.defaultFilePath(schema);
		}

		const shouldUseSimplified = this.shouldUseSimplified(schema);
		if (shouldUseSimplified.useSimplified) {
			return this.pickFileAndOpenSimplified(schema, options, shouldUseSimplified.isSetting);
		}
		return this.nativeHostService.pickFileAndOpen(this.toNativeOpenDialogOptions(options));
	}