Open RPMSG File

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Fix RPMSG Extension Association

How to Correctly Associate RPMSG Files with Microsoft Outlook

If you find that your computer is trying to open RPMSG files with Adobe Acrobat, it's likely that the file association has been incorrectly set. RPMSG files are used for delivering e-mails with the Rights-Managed Email Object Protocol enabled, and they should be opened with Microsoft Outlook or a similar email client that supports Rights Management protection. Here's how you can fix the incorrect file association and set RPMSG files to open with Microsoft Outlook:

1. Right-click on an RPMSG file

Find an RPMSG file on your computer, right-click on it, and select "Properties" from the context menu.

2. Change the "Opens with" setting

In the "Properties" window, go to the "General" tab and find the "Opens with" section. Click on the "Change" button.

3. Select Microsoft Outlook

A window will pop up with a list of programs that you can use to open RPMSG files. Find and select "Microsoft Outlook" from the list. If you don't see Microsoft Outlook in the list, click on "More apps," scroll down, and click on "Look for another app on this PC." Then navigate to the folder where Microsoft Outlook is installed (usually "C:\Program Files\Microsoft Office\root\Office16" or "C:\Program Files (x86)\Microsoft Office\root\Office16"), select "OUTLOOK.EXE," and click "Open."

4. Apply the changes

Click "OK" to close the "Open with" window, and then click "OK" again to close the "Properties" window. The RPMSG file should now be associated with Microsoft Outlook.

5. Test the new association

Double-click on the RPMSG file to make sure it opens with Microsoft Outlook. If it doesn't, repeat the steps above and make sure you selected the correct program.

6. Set the association for all RPMSG files

If you want to set the association for all RPMSG files on your computer, go to "Settings" > "Apps" > "Default apps" > "Choose default apps by file type." Scroll down to ".rpmsg," click on the program currently associated with it, and select "Microsoft Outlook" from the list.


RPMSG files are meant to be opened with email clients that support Rights Management protection, such as Microsoft Outlook. If your computer is trying to open these files with Adobe Acrobat or another program, you can easily fix the association by following the steps above. Once you've set the correct association, you'll be able to open and view RPMSG files with Microsoft Outlook without any issues.

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RPMSG Quick Info
  Rights-Managed Email Object Protocol File
Opens with
  Microsoft Outlook
  Microsoft Outlook Web App (OWA)
  Azure Information Protection viewer