Modula-3 object
File type: Source code and script file
The mo file extension is related to the Modula-3 programming language and used for its object files.
Found 8 different file type records with the same mo filename suffix.
File type category:
Source code and script file
Date updated: March 23, 2018
Record marked as obsolete and not updated for a long time.
The mo file extension is associated with Modula-3, a programming language conceived as a successor to an upgraded version of Modula-2. While it has been influential in research circles (influencing the designs of languages such as Java and C#), it has not been adopted widely in industry.
It was designed by Luca Cardelli, Jim Donahue, Mick Jordan, Bill Kalsow and Greg Nelson at the Digital Equipment Corporation (DEC) Systems Research Center (SRC) and Olivetti in the late 1980s.
An mo file contains object for Modula-3.
You cannot access these files manually.
Probably cannot be converted to anything else.
File type category:
Settings, options, themes or skins file
Date updated: August 10, 2018
The mo file extension is also reported to be used for language files in Audacity a recording and sound editing software, available for Mac, Windows and Linux.
It is used for localization purposes.
Probably not meant to be accessed by the user.
Probably cannot be converted to anything else.
Software apps that manage or store settings in mo files:
File type category:
Various data file
Date updated: May 4, 2018
The mo file extension is also used for one of the default file formats in CATIA Dymola program. Dymola is a program for multi-engineering modeling and simulation.
These mo files contains simulation data.
Use Dymola to work with *.mo files.
Probably cannot be converted to anything else.
File type category:
Various data file
Date updated: May 14, 2019
The mo file extension is also used for machine object files used in GNU Gettext. Program used for writing project documentation, available for Unix-based operating system, distributed under Free Software Foundation.
Use Gettext. Might also be able to view these files using any text editor.
Probably cannot be converted to anything else.
Software applications that handle other tasks involving mo files:
Linux/Unix
File type category:
Binary file
Date updated: February 12, 2019
The mo file extension is also reported to be used for message catalog binaries in some Unix operating systems. Some users indicated that it is perhaps related to Wordpress publication system.
Probably not meant to be accessed by the user.
Probably cannot be converted to anything else.
Software applications that handle other tasks involving mo files:
Linux/Unix
File type category:
3d graphics, CAD-CAM-CAE file
Date updated: November 29, 2018
The mo file extension seems to also be used for the default model file in Modelica, an object-oriented modeling language used for industrial applications, papers, tools, mailing list, and links.
Except for Modelica, some third party programs also use .mo models.
Possibly can be converted to other model files.
Software applications that can open mo files:
Microsoft Windows
Software applications that can edit mo files:
Microsoft Windows
Software capable of saving mo files:
Microsoft Windows
Software apps that create mo files:
Microsoft Windows
Software apps that import mo files:
Microsoft Windows
File type category:
Various data file
Date updated: October 2, 2026
Pidgin is an instant messaging client for Linux and other Unix-like systems. Its .mo files provide localized versions of the program's interface, including menus, messages, and tooltips.
Pidgin loads the appropriate language file from its localization files when it starts, based on the system or user language settings. The files are compiled translation catalogs and are normally installed with Pidgin rather than created or edited by end users.
There is normally no need to open a Pidgin .mo file directly. Install it in Pidgin's localization directory, then restart Pidgin and select the corresponding system language if necessary. The client loads the file automatically when that language is active.
Because the file is a compiled language catalog, it is not intended for editing in a regular text editor. Translation developers can inspect it with suitable localization tools.
A Pidgin .mo file usually does not need to be converted. It is already in the compiled form that Pidgin uses for localized interface text.
To change a translation, modify the corresponding Pidgin translation source and compile it again with compatible gettext tools.
Software applications that handle other tasks involving mo files:
Linux/Unix
File type category:
Game file
Date updated: October 7, 2026
The .mo file extension is associated with Transport Fever, a management simulation and railroad tycoon computer game for Microsoft Windows and Mac.
A .mo file stores the game's text resources, such as interface text, messages, descriptions, and translations.
Transport Fever loads these files as part of its language and text data.
Transport Fever opens and uses its .mo files automatically when the game needs the corresponding text data.
Use any text editor to view content of *.mo files.
There is no meaningful general-purpose conversion for a Transport Fever .mo file. It is a resource consumed by the game, not a document format intended for export.
When changing the game's text or translations, use the appropriate Transport Fever localization or modding workflow and produce the resource files required by the game.
Software applications that handle other tasks involving mo files:
Multiplatform
Language
