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October 2, 2026
.MSO
Microsoft Office HTML/OLE Data Stream (oledata.mso)
Misc Files
updated Aug 30, 2026

A file with the .mso extension contains data related to an email attachment sent with the Microsoft Outlook email client in the form of an Office 2000 or later document, typically generated by Microsoft Word. Information in an .mso file allows Outlook to open…

SIGNATURE4163746976654D69"ActiveMime"
OPENS ONMac OSmacOSWindows
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