File Extension Database

Open RPMSG File

RPMSG files are used to store e-mail messages in encrypted format. E-mail messages in RPMSG files could not be opened without decryption by software designed for it. But even after decryption RPMSG file could not be read by everyone. Only designated recipients are allowed to view a message encoded inside the RPMSG file. Microsoft Outlook software which is the primary software which uses this format can decode the RPMSG file and recognize and enforce permissions. If you receive an RPMSG file and on the recipients list, then you will be able to view what is inside it. If you are not on the permission list, you will not be able to open it. Besides viewing permissions RPMSG file restricts forwarding and copying permissions.

The best software to view RPMSG file is Microsoft Outlook. You can either download it as part of Microsoft 365 or Microsoft 365 subscriptions. When you receive a message in RPSMG format Microsoft Outlook automatically parses it and enforces viewing and forwarding permissions encoded in it.

If you do not want to install Microsoft Outlook or Microsoft Office 365 software, you can still view RPMSG files online by going to outlook.com and signing in with your corporate account (the one which has permissions to view the RPMSG file). Another way to view RPMSG file is to download Microsoft Azure Information Protection client. This tool allows viewing RPMSG encrypted messages and files by using your corporate account and without the need of Microsoft Outlook. Still, in order to use this tool you will need to either sign in or create RMS (rights management service) account with Microsoft Azure in accordance with "User Guide: View protected files with the Azure Information Protection unified labeling client".

RPMSG files are stores as compound binary files and are not plain text. You cannot view them with text editor and only specialized software described above can open RPMSG files.

Following Microsoft products have support for RPMSG files:



Microsoft Exchange Server 2003
Microsoft Exchange Server 2007
Microsoft Exchange Server 2010
Microsoft Exchange Server 2013
Microsoft Exchange Server 2016
Microsoft Exchange Server 2019
Microsoft Office Outlook 2003
Microsoft Office Outlook 2007
Microsoft Outlook 2010
Microsoft Outlook 2013
Microsoft Outlook 2016
Microsoft Outlook 2019
Microsoft Outlook 2021

RPMSG File helpful links and resources

Converting RPMSG files to PDF

Since RPMSG is an encrypted format it is not possible to convert it using online conversion, extraction or viewer tools. Prior to conversion you need to extract content in RPMSG file using either Microsoft Outlook or Microsoft Azure Information Protection Client. You will need to login with your e-mail account to one of these applications and depending on your permissions to the the e-mail message encrypted in RPMSG file you will be able to view and print it (certain messages in RPMSG format may prevent printing in their permissions). Below is the process of converting RPMSG file to PDF.

Convert to PDF with Microsoft Outlook

Download and install Microsoft Outlook
Login with your e-mail account which has permissions to view the message stored in RPMSG file
Select File->Print from the main Microsoft Outlook menu.
Select "Save Print Output as" and choose folder where to place resulting PDF file

Convert to PDF with Microsoft Azure Information Protection Client

Download and install Microsoft Azure Information Protection Client from https://portal.azurerms.com/#/download
Launch the Microsoft Azure Information Protection Client and login to it with your e-mail account which has permissions to view the message stored in RPMSG file
Select File->Print from the main Microsoft Outlook menu. Note that it may be disabled if you do not have printing permissions to the document.
Select "Save Print Output as" and choose folder where to place resulting PDF file

Convert RPMSG to DOC or DOCX File

Similarly in order to print or convert RPMSG file to PDF you need to first decrypt information in it using either Microsoft Outlook or Microsoft Azure Information Protection Client. Depending of the settings in IRM (Information Rights Management) system on the server you will be able to copy or save contents of the file to different formats including DOC and DOCX. In case of Microsoft Outlook you can choose File->Save As and then select Word Document (*.docx) from the drop down list. In case of Microsoft Azure Information Protection Client you can copy contents of the e-mail and paste it to the Microsoft Word and from there save it as DOCX file.

Information Rights Management and RPMSG files

Information Rights Management or IRM is a set of technologies which enable to set various permissions and content protection settings to the documents created and consumed by employees in organization. IRM enabled infrastructure prevents that important information could not be shared accidentally outside or to inappropriate audience.

RPMSG file is a container file for emails with IRM technologies from Microsoft. It supports wider spectrum of content protection features which prevent sensitive information from being read, printed, forwarded, or copied.

How Can I Open RPMSG File on Windows

We researched and learned that the best way to open RPMSG file is to find a RPMSG file in question in Windows OS File Explorer and double click on it to launch the corresponding application.
If a RPMSG file is not opened in an application and you instead get a "Windows can't open a file" error message you should try looking for an application which can open the file in question.
If you know the application which can open RPMSG file then run it and see if there is a File->Open main menu option in the application.
If you don't know the application which function as RPMSG file opener then try to search online for "RPMSG viewer", "application to open RPMSG file" or "open RPMSG file" queries in the search engine you like.
Install the application you found and check if it can open RPMSG file

How Can I Open RPMSG File on Mac OS

We recommend to find a RPMSG file in question in Mac OS Finder and double click on it to launch the corresponding application.
If a RPMSG file is not opened in a Mac OS application and you instead get a "There is no application set to open the file" error message you can click on "Search App Store" in the error dialog and Mac OS will show you applications compatible with RPMSG file.
If you know the Mac OS application which can work as RPMSG file opener you can choose the "Choose Application..." option in the error box to associate the file extension and open RPMSG file in it.
If you don't know the application which can open RPMSG file then try to search for "RPMSG viewer", "application to open RPMSG file" or "read RPMSG file" queries in the online search engine you like.
Install the application you found and check if it can read RPMSG file

How Can I Open RPMSG File on Android

If you downloaded a RPMSG file on Android device you can open it by following steps below:

In the Android apps list on your Android device find "My Files" or "File manager" app and tap to start it.
Tap on "Downloads" folder inside the app.
You should see your downloaded RPMSG file in that folder.
Tap on the file. If Android device supports opening the file you downloaded it will open in the corresponding app.
If file does not open you can look for the corresponding app that can open the file by searching Android App Store for the "RPMSG".
If you cannot open the file with the apps from Android App Store it is possible that the file could only be opened on desktop platforms such as Windows or Mac OS. Try searching for "RPMSG viewer", "RPMSG file reader" online and see if any desktop applications can open it.
It is also possible that the file you downloaded is outdated and is no longer supported.

How to Open RPMSG File on iPhone or iPad

To open RPMSG File on iOS device follow steps below:

We advies to open Files app on your iPhone or iPad device. You can find it by swiping down on the home screen and typing "Files" in the search bar.
Tap on the Downloads folder on the Files app home screen.
You will see all files that you recently downloaded. Tap on the RPMSG file to view it.
If you have the right app that can open it it will automatically launch and open your file.
If you don't have the app which can open it you need to serch Apple app store for "RPMSG". This way you can find apps which can open RPMSG files.
If this doesn't help it is possible that your file could be opened only by the desktop application. To find an app which can open it on desktop look for "RPMSG viewer" or "RPMSG file" online in your favorite search engine.

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