P7Z File Extension
S/MIME Compressed Message
- File Type p7z
- Popularity
- Application Microsoft Outlook
- Category Email Program Files, Encoded Files
What is a P7Z file?
The P7Z file extension is linked to S/MIME Compressed Message and belongs to the categories of Email Program Files and Encoded Files, which include 336 files.
P7Z files are compatible with various operating systems, including Mac OS, Windows and Linux. To open a P7Z file, you can choose from 2 programs such as Microsoft Outlook and Mozilla Thunderbird.
MIME types
- application/pkcs7-mime
Programs that support P7Z files
How to open a P7Z file?
If you cannot open a P7Z file, it is most often due to missing software. Select a program from the list according to your operating system. Then go to the official website of the program developer, download it, and install it on your device.
Microsoft Outlook and Mozilla Thunderbird are recognized as the most popular software solutions for dealing with P7Z files. To set up the newest version of Microsoft Outlook on your device, simply go to the official Microsoft website. There you can download the edition compatible with every operating system.
Once installed, Microsoft Outlook will be set as the default program, and P7Z files will open automatically.
Set Microsoft Outlook to open P7Z by default
Setting a default program by file type in Windows
- Right click on your P7Z file, then select "Open with" and click "Choose another application";
- Find the Microsoft Outlook application in the pop-up window and select it as your preferred program;
- Select the "Always use this application" check box and click "OK" to save your selection as the default application for opening P7Z files.
Change default apps on Mac
- Right-click or use Control + Left-click on the desired P7Z file to access the file’s context menu;
- Select "Open in application" and click "Other";
- At the bottom of the window, find the "Enable" menu, where "Recommended Programs" is already selected by default;
- Within this menu, select "All Programs" and then locate Microsoft Outlook. Check the box next to "Always open in app" to set it as the default program.
How to edit a P7Z file?
Editing P7Z files requires installing professional software that lets you open and edit email program files. Online editors have more limitations compared to dedicated S/MIME Compressed Message programs.
Best P7Z editors in 2026
Considering the mentioned criteria, we have compiled a list of P7Z editors that may suit your needs.
| P7Z Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Microsoft Outlook | Microsoft | Windows, Mac OS | 4.8 out of 5 (43 reviews) |
| Mozilla Thunderbird | Mozilla | Windows, Mac OS, Linux | 4.2 out of 5 (41 review) |
Easy P7Z Troubleshooting
Certain problems with P7Z files can be conveniently fixed with small software tweaks. Here are some helpful tips to address them.
What are the steps to repair a damaged P7Z file?
Open the corrupted P7Z file in a recovery program and select the "Repair" menu item. Please be patient while the recovery process completes, which will automatically restore the damaged email program files.
How do I know if my P7Z file is corrupted?
Corrupted P7Z email program files may show the following signs:
- Attempts to open the file result in errors or failed results;
- Editing the archive in Microsoft Outlook is accompanied by slow performance or delays;
- The file causes Microsoft Outlook or other programs to hang or crash during operation;
- Unexplained increase in P7Z file size;
- Error messages appear while working with the file;
What are the reasons behind Microsoft Outlook crash?
The likely cause of Microsoft Outlook crashing is lack of software updates. Install the latest updates available for Microsoft products.
Restarting your computer is often an effective solution to resolve various common problems. Therefore, it is recommended to do so before making any changes to the software configuration.