File Extension MSO

.MSO File

File extension: MSO
File type: OLE Web Page Storage Stream


Notes about the MSO file extension:



To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The MSO file type is primarily associated with 'Word' by Microsoft Corporation. Office Word is an authoring program that gives you the ability to create and share documents using a set of writing tools. When sending HTML messages with an attached Microsoft Office 2000 document, the message is sent as an Outlook HTML message, not an Office Envelope message. The Oledata.mso file contains necessary information to properly render the attachment in the message in its originating program. This is known as "round tripping." There is no useful information for the user in this file and it is not editable. Do not delete this file; doing so could render the attached file unuseable. On computers without Outlook 2000 installed, you will see the Oledata.mso file as an additional attachment.

Detailed information for file extension MSO:


Primary association: Word
Company: Microsoft Corporation

Other applications associated with file type MSO:

  • ActiveMime (Object) The identifying characters used for this association are - Hex: 41 63 74 69 76 65 4D 69 6D 65 , ASCII: ActiveMime
  • FrontPage File by Microsoft Corporation
  • Math Script Object FileNote: This file type can become infected and should be carefully scanned if someone sends you a file with this extension.
  • MedlySound (Sound/Module)Audio routine and editor created by Paul van der Valk. This association is classified as Audio. The identifying characters used for this association are - Hex: 4D 53 4F 42 00 , ASCII: MSOB
  • Orgchart File by Microsoft Corporation
File Identifier - TrID
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database




To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

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