DOS SYS
File conversion

Convert DOS to SYS

QUICK ANSWER
Is it possible to convert DOS to SYS?
Yes - DOS converts to SYS.

If the .dos file is a renamed CONFIG.SYS, rename the extension back to .sys.

Also to SYS: INF · DRV · 386

On this page

Tested on macOS, Windows & Linux
Last verified Oct 2026

More free converters

HEIC, PNG, WEBP, MP3 and more - every tool here is free.

Open the toolbox

How to convert DOS to SYS

Converting a .DOS file to .SYS lets you open the content in software that prefers the .SYS format, though some details may change compared with the original. We are still putting together the list of programs that handle .DOS files.

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

About these formats