MSO File Extension

MSO file icon
Inline E-mail Attachment
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What is MSO file?

File with MSO extension contains data related to email attachment send with Microsoft Outook email client in the form of a MS Office 2000 document, typically generated by Microsoft Word. Information in MSO file allow user to open the attachment as a part of email message as a inline HTML document.

MSO files are typically named Oledata.mso and are not visible the both sender and receiver of the message, given that they use Outlook for email. If not, MSO file will be seen as a standard email attachment, and the document file will also be treated as a attachment file. A attachment named header.html, which contains message header, will also be present. MSO don’t hold any information useful to the users and should not be opened manually.

Programs that support MSO file

We hope we helped you solve the problem with the MSO file. If you do not know where you can download the application from our list, click on the link (which is the name of the program) - you will find more information there on the location where to download the secure setup version of the required application.

What else may cause problems?

There can be more reasons which determine that you are not able to open the MSO file (apart from the lack of the proper application installed).

First - the MSO file may be incorrectly associated with the application installed to support it. In this case, you need to change this association by yourself. To do this, right-click on the MSO file that you want to edit, click "Open with" and then select the program from the list that you have installed. After this operation, the problems with opening the MSO file should be solved.

Second - the file you want to open can simply be damaged. Then, the best solution is to find a new version of given file, or download it again from the same source as before (maybe for some reason in the previous session the download of the MSO file has not been completed and it cannot be opened properly).

Do you want to help?

If you have additional information about the MSO file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on MSO file.

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