Home : File Types : MSO File (2 File Associations)

.MSO File Extension

File Type 1Microsoft Office Macro Reference File

DeveloperMicrosoft
Popularity
3.3 (63 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryMisc Files
FormatN/A

Unknown

File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.

What is a MSO file?

An MSO file is a macro reference file created when saving a Microsoft Office document as a webpage. It contains information about macros and OLE (Object Linking and Embedding) objects included in the original file and may be referenced by the created webpage as a style sheet. MSO files may be viewed with a text editor, but will be unreadable since the contents are encoded.

More Information

Most users will only see the MSO file as an attachment to an email. Do not open the file if it has the ".mso" extension because it most likely contains a virus that will be installed on your computer when opened.

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Programs that open MSO files
Windows
Should not be opened manually
Mac
Should not be opened manually
Updated 11/17/2016

File Type 2Inline E-mail Attachment

DeveloperMicrosoft
Popularity
2.3 (14 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryMisc Files
FormatN/A

Unknown

File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.

.MSO File Association 2

File sent with Microsoft Word 2000 e-mail attachments; often named "Oledata.mso;" contains information that allows the attachment to be rendered within the e-mail message.

More Information

The Oledata.mso file will appear as a separate attachment on computers that do not have Microsoft Outlook 2000 or later installed.

Programs that open MSO files
Windows
Microsoft Outlook 2016
Mac
Microsoft Outlook 2016
Updated 1/4/2008

.MSO Extension Information

This page contains information about the file extension MSO and its known file associations. Our goal is to help you understand what a *.mso file is and how to open it.

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