If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .3do

On this page, we're going to take a closer look at the .3do file extension. We'll explain what exactly a .3do fileformat is and how you can use it. If you're interested in learning more details about this type of file, we'll show you where to find them. And if you ever need to convert .3do files into different formats, we'll give you some tips on how to do that too. Let's see the 2 file formats associated with this file extension!


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3do file - Total Annihilation 3D Object

Total Annihilation 3D Object

The 3DO file is a Total Annihilation 3D Object. Total Annihilation is a real-time strategy video game created by Cavedog Entertainment.
Category: Game Data files
Application: Total Annihilation
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
.ufo Total Annihilation Third-party Unit Data
.zrb Total Annihilation Data
.tad Total Annihilation Demo Data
.ccx Total Annihilation Mod Data
3do file - FreeDO Phoenix ISO Image

FreeDO Phoenix ISO Image

The 3DO file is a FreeDO Phoenix ISO Image. FreeDO is a Panasonic 3DO emulator.
Category: Disk Image files
Application: FreeDO
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
.dart DiskImageMounter DART Image
.tdi Toshiba Disc Creator Image

The .3do file extension might not only belong to a single type of file, there could be various kinds that use it. Keep in mind that files with the .3do extension may contain various content types. If you have helpful information about this extension, write to us!

Could someone have spelled the .3do file extension wrong?

In our database, we came across the following similar extensions:

.3d Geocadabra 3D Data
.edo GROMACS Essential Dynamics Output
.3o Advent 3B2 Object Graphic
.wdo WinDev Component List
.rdo Oracle Database Redo Log
.3dk OS/2 Floppy Disk Image

The .3do extension is frequently misused

People sometimes confuse the .3do filename extension. Based on the searches on our site, here are the most common misspellings from the past year.

3d (1), edo (1), 3o (1), wdo (1), rdo (1), 3dk (1), 3d0 (1), do (1), 3dl (1), 3dp (1)

Having trouble opening a .3do file?

If you want to open a .3do file on your computer, you just need to have the appropriate program installed. Incorrect settings for the .3do association can trigger this error.

Windows can't open this file:

File: example.3do

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2016/2019/2022, Windows 7, Windows 8, Windows 10, Windows 11, Linux, Mac OS X, macOS, iOS, Android