@independentsoft/msg/examples/get-attachments.js

Outlook .msg file module

import * as msg from './../independentsoft/msg.js';
import * as fs from 'fs';

const buffer = fs.readFileSync("e:\\message.msg");
const message = new msg.Message(buffer);

for(let i=0; i < message.attachments.length; i++) {
    const attachment = message.attachments[i];
    fs.writeFileSync("e:\\temp\\" + attachment.longFileName, attachment.toBytes());
}