src/vs/workbench/services/dialogs/electron-sandbox/fileDialogService.ts/FileDialogService/pickFileToSave
class FileDialogService:	async pickFileToSave(defaultUri: URI, availableFileSystems?: string[]): Promise<URI | undefined> {
		const schema = this.getFileSystemSchema({ defaultUri, availableFileSystems });
		const options = this.getPickFileToSaveDialogOptions(defaultUri, availableFileSystems);
		if (this.shouldUseSimplified(schema).useSimplified) {
			return this.pickFileToSaveSimplified(schema, options);
		} else {
			const result = await this.nativeHostService.showSaveDialog(this.toNativeSaveDialogOptions(options));
			if (result && !result.canceled && result.filePath) {
				const uri = URI.file(result.filePath);

				this.addFileToRecentlyOpened(uri);

				return uri;
			}
		}
		return;
	}