.MSO File Extension

File Type:
Inline E-mail Attachment

Having trouble opening .mso extension? Don't panic! This page explains what mso files are as well as suggests programs you may use to open mso files. You can download these programs through this page.

What is a MSO file?

Mso file extension has Inline E-mail Attachment file type, developed by Microsoft, which is associated with the "misc files" category.

Used by Microsoft Word 2000 e-mail attachments, the file provides information, which enables users to render the attachment right within an e-mail.

To learn how you can open the given file, read the information below.

mso file icon
File Type:
Inline E-mail Attachment
Misc Files

How to open MSO file?

Double click the mso file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .mso extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 1: Fix file association errors

Follow these steps in order to automatically fix the mso extension associations' problem in no time:

  • Step 1: Click on "Download Solution" to download automatic tool provided by WikiExt.
  • Step 2: Click "Start Scan" to identify all potential issues.
  • Step 3: Review scan results and click "Fix Items".

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With: Windows XP, Vista, 7, 8/8.1, 10

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the mso file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open MSO files

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the mso file as well. Download Universal File Viewer for your OS.

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