Total Annihilation object
File type: Game file
A .3do file is an object file used by the Total Annihilation computer game.
It contains a model of an in-game object.
Found 2 different file type records with the same 3do filename suffix.
File type category:
Game file
Date updated: October 22, 2026
The .3do file extension is associated with Total Annihilation, a real-time strategy game developed by Cavedog Entertainment for Microsoft Windows and Apple Mac systems.
A .3do file contains the 3D model data for an object used in the game. These files form part of the game's resource files.
The format is a legacy game format associated with the original Total Annihilation software. It can also be viewed on Microsoft Windows with 3D Object Converter.
Total Annihilation reads its .3do files as game resources. To inspect a file separately on Microsoft Windows, open it with 3D Object Converter, which can view Total Annihilation objects.
3D Object Converter can export .3do files to other supported 3D formats on Microsoft Windows. An exported model may not retain all of the game-specific information needed for use in Total Annihilation.
Programs for viewing 3do files:
Microsoft Windows
Software apps that import 3do files:
Microsoft Windows
Software applications that handle other tasks involving 3do files:
Microsoft Windows
File type category:
Disk image (ISO) binary file
Date updated: March 5, 2019
Files with 3do file extension are related to the FreeDO, an emulator of 3DO video gaming console available for Microsoft Windows operating system.
The 3do file stores ISO image with video game for 3DO console.
Use FreeDO to open *.3do images.
Probably can be converted to other formats.
Software applications that can open 3do files:
Microsoft Windows
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