Files with mj3 file extension can be usually encountered as some sort of on-line purchase links from old id Software games.

Detailed description

Software that open mj3 file

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MJ3 file extension - id Software online sale data

What is mj3 file? How to open mj3 files?

File type specification:

Various data file type icon Various data file type

The mj3 file extension were frequently used on files found on CD-ROMs with games based on id Software engine, such as DOOM or Heretic.

The purpose of .mj3 files was to allow the user of one game, to buy online the other game. So for example on Heretic CD-ROM, there was mj3 file for DOOM game.

This mj3 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

The default software associated to open mj3 file:

Doom icon

id Software LLC logoDoom  Microsoft MS-DOS software

Company or developer:
id Software LLC

Doom is legendary first person shooter computer game created by the id software released in 1993 for MS-DOS. Doom contains 24 levels divided to the three episodes. The first episode is distributed as a shareware and it is available to download for free.

Doom II icon

id Software LLC logoDoom II  Microsoft MS-DOS software

Company or developer:
id Software LLC

Doom 2 is a successor of legendary first person shooter computer game called Doom released in 1994. Doom 2 contains 30 new levels. Gamers can play Doom 2 solo, with two people over a modem, or with up to four players over a LAN (supporting IPX protocol).

Heretic icon

Raven Software logoHeretic  Microsoft MS-DOS software

Company or developer:
Raven Software

Heretic is first person shooter computer game from the medieval times based on Doom 3D engine. Players took the role of Corvus, an Elven hero whose race was nearly eliminated by a horde of evil monsters from another dimension. The first episode of Heretic was released as shareware.

Help how to open:

These old files were used to purchase the game online, probably acted as some sort of link or ticket.

How to convert:

A conversion for *.mj3 file seems unlikely and seems to be not possible.

List of recommended software applications associated to the .mj3 file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open mj3 file, edit mj3 file, convert mj3 file, view mj3 file, play mj3 file etc. (if exist software for corresponding action in File-Extensions.org's database).

Unspecified and all other actions for computer programs working with mj3 file - id Software online sale data

Click on the software link for more information about Doom. Doom uses mj3 file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).

Microsoft MS-DOS:

Main software associated with mj3 file by default:
Doom small icon Doom
Doom II small icon Doom II
Heretic small icon Heretic
Other suggested software:
HeXen small icon HeXen

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