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.mso

File Type Generic IconOutlook In-Line Office Attachment
File Format Proprietary (Microsoft)
Usage Referenced by an application; not meant to be opened manually
Popularity ★ ★ ★ ★ ☆  Common
Description

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.

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

Open With
Windows

IconMicrosoft Outlook

macOS

IconMicrosoft Outlook

Published 2007
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Information from the PC File Extensions Reference
https://pc.net/extensions/mso
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