Open MSO file

An MSO file is a macro reference file created by saving a Microsoft Office document as a web page.
It contains information about macros and OLE objects (Object Linking and Embedding) included in the original file and can be referenced by the created web page as a style sheet.
MSO files can be opened with a text editor, but this will be useless as the characters will be unreadable due to the content being encoded.
If you see the MSO file as an email attachment, do not open it as it most likely contains a virus or other suspicious program.

Inline E-mail Attachment

File sent as Microsoft Word 2000 email attachments; often called
‘Oledata.mso’, it contains information that allows the attachment to be
rendered in the email message.

Open MSO File on Windows OS

  • Look for an MSO file you need to open in Windows Explorer and double-click on it
  • If the file doesn’t open automatically and you see a “Windows can’t open a file” message then you should search for a program which can open MSO file
  • If you have a program which can open MSO file installed on your computer then launch that program and select “File” and then “Open” or similar options from its menu to open the MSO file
  • If you don’t have the program installed then you need to try searching for “MSO wiki”, “how to open MSO file” in the search engine.
  • Once you find the application, install it on your computer
  • After the program is installed double-click on the MSO file to open it

File extensions are used by Windows operating system to specify what kind of information is stored in the file. Every file in Windows OS needs to have file extension and file extensions are used by Windows to determine which application it should use to open the file. Every application installed on Windows OS places information about which extensions it could open into the Windows registry and Windows uses this information to determine which application it should launch when user double-clicks on the file. If application which can open MSO file is not installed, then Windows will show ‘Windows can’t open MSO file’ message and buttons to either select an application on the computer which can open the file or to search the web for the application which can open MSO file.