What's the MSO File?

Writer:   |   Refreshed: December 05, 2018

Microsoft Silver

MSO File Summary

There are five file types associated with the MSO File Extension, with the most widely-observed being the Microsoft Organization Chart Data File format. According to our database, five distinct software programs (conventionally, Microsoft Organization Chart developed by Microsoft Corporation) will enable you to view these files. The MSO File Extension are listed predominantly as Data Files, while in other circumstances they can be Uncommon Files.

File Extension MSO files have been identified on both desktop and mobile devices. MSO files have a "Low" Popularity Rating; this means that they are not present on most devices.

If you are having problems opening MSO files, or would simply like to learn more about the software programs and developers that are associated with them, please see the complete information contained below.

Low
File Type Popularity
2056
Ranking

/ 11690

Active

Importance

5

December

2018

Edited

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Types of MSO Files

  5 known file types use this extension

Principal MSO Type

.MSO
File Format:.mso
Classification:Microsoft Organization Chart Data File

The MSO file extension is best known as the file extension used by Microsoft Organization Chart to store chart data. The stored chart data can then be imported into any Office document as an object.

Organization: Microsoft Corporation
Function:Data Files
Entry: HKEY_CLASSES_ROOT\.mso

Software Programs That Open The Microsoft Organization Chart Data File:


Microsoft Organization Chart by Microsoft Corporation

Windows

Other MSO Descriptions

.MSO
File Format:.mso
Classification:Microsoft Office Macro Reference File

MSO files are macro reference files created when saving office documents as web pages. The information it contains is about macros and OLE (Object Linking and Embedding) objects included in the original file

Organization: Microsoft Corporation
Function:Uncommon Files

Software Programs That Open Microsoft Office Macro Reference File Files:


Should Not Be Opened Manually by Unknown Developer

Compatible with:

Windows
.MSO
File Format:.mso
Classification:Microsoft Inline E-mail Attachment

An MSO file may also be a file sent with MS Word 2000 e-mail attachments. It contains data that allows the attachment to be executed within the e-mail message.

Organization: Microsoft Corporation
Function:Uncommon Files

Software Programs That Open Microsoft Inline E-mail Attachment Files:


Microsoft Outlook by Microsoft Corporation

Compatible with:

Windows
Mac
.MSO
File Format:.mso
Classification:OLE Web Page Storage Stream

In past versions of MS Word, MSO files are used as an extension for a special attachment format, possibly in association with MS Outlook. This often happens when Word is used as an e-mail editor, with the document being sent out as the email body which is in HTML format.

Organization: Microsoft Corporation
Function:Data Files

Software Programs That Open OLE Web Page Storage Stream Files:


Microsoft Word by Microsoft Corporation

Compatible with:

Windows
Mac

Microsoft Outlook by Microsoft Corporation

Compatible with:

Windows
Mac
.MSO
File Format:.mso
Classification:ActiveMime Object File

The MSO file extension is also used for ActiveMime objects, an offshoot of ActiveX content.

Organization: Microsoft Corporation
Function:Data Files

Software Programs That Open ActiveMime Object File Files:


Microsoft Windows by Microsoft Corporation

Compatible with:

Windows

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MSO Popularity


Popular OS Rank

Windows 7 (48%)
Windows 10 (42%)
Windows 8.1 (5%)
Windows XP (2%)

OS Popularity

7 (45.73%)
10 (44.56%)
8.1 (5.41%)
XP (2.79%)
8 (0.97%)


MSO File Complications


Frequent MSO Opening Issues

Microsoft Organization Chart Removed

If you attempt to load your MSO file, you experience a message such as "Can't Open MSO Files". When this happens, it is commonly due to Microsoft Organization Chart missing in %%os%%. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.


Tip: When another MSO application is installed, you can choose to open it by selecting "Show Apps" and using that program.


Outdated Microsoft Organization Chart

It is possible that your version of Microsoft Organization Chart isn't able to open your Microsoft Organization Chart Data File file due to incompatibility. If you do not have the proper version Microsoft Organization Chart (or any of the other programs listed above), you may need to try downloading a different version of it, or one of the other software applications listed above. This problem is predominately due to having a Microsoft Organization Chart Data File file version that was created by a newer version of Microsoft Organization Chart than what you have installed on your PC.


Tip: If you right-click on your MSO file, then select "Properties" (Windows) or "Get Info" (Mac), you can obtain hints about what version you need.


Regardless, most of the MSO file opening problems relate to not having the right version of Microsoft Organization Chart installed.


Other MSO File Issues

Assuming you have the right Microsoft Organization Chart version installed, other problems can prevent you from opening MSO files. There can be external issues inside of %%os%% that are causing these errors when opening MSOs. Problems unrelated to software:

  • Windows Registry MSO file paths that are incorrect
  • Deletion of the MSO file description from the Registry by mistake
  • Corrupt install of Microsoft Organization Chart or other MSO-related program
  • The MSO itself is corrupted
  • Your MSO has adversely impacted by malware
  • Hardware associated with MSO has outdated drivers
  • Insufficient system resources to successfully open Microsoft Organization Chart Data File files

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