Notes about the MSO file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
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.