Files with mso file extension might also be found as ActiveMime objects, some sort of spin-off of ActiveX content.

There are 3 other file types using
the MSO file extension!

mso icon.mso - Microsoft Organization Chart chart data

empty icon.mso - MedlySound module

mso icon.mso - OLE web page storage stream

Detailed description

Software that open mso file

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MSO file extension - ActiveMime object

What is mso file? How to open mso files?

File type specification:

Various data file type icon Various data file type

The mso file extension was also reported to be used for ActiveMime objects, some sort of 'spin-off' of ActiveX content.

ActiveMime is simply zlib-compressed data starting at offset 0x32, then a standard OLE file with the VBA macro project.

The default software associated to open mso file:

Microsoft Windows icon

Microsoft Corporation logoMicrosoft Windows  Microsoft Windows software

Company or developer:
Microsoft Corporation

A family of operating systems developed by the Microsoft Corp. The first Windows was released in 1985 as a GUI add-on to MS-DOS.  MS-DOS based Windows versions were developed to 2000, when was released the last version called Windows ME. Windows based on NT core started in 1993. Windows NT family are developed to these days, the latest version is called Windows 10.

Help how to open:

You most likely cannot access these files manually as part of other program.

How to convert:

We do not know about any possible conversion for this type of *.mso files.

File identification strings:

HEX code: 41 63 74 69 76 65 4D 69 6D 65
ASCII code: ActiveMime

List of recommended software applications associated to the .mso 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 mso file, edit mso file, convert mso file, view mso file, play mso file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with mso file - ActiveMime object

Click on the software link for more information about Microsoft Windows. Microsoft Windows uses mso 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 Windows:

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