PMM File Extension

PMM file icon

Pegasus Mail Mailbox Format

What is a PMM file?

Pegasus Mail Mailbox Format, identified by the PMM extension, is a Email Program Files type and includes 50 files.

With the creation of the Pegasus Mail Mailbox Format (PMM), David Harris introduced file format along with programs built for their use.

PMM files are supported by Windows. You can others a PMM file using one of 2 programs, for example Pegasus Mail and Aid4Mail.

Programs that support PMM files

How to open a PMM file?

The most common reason why a PMM file cannot be opened is the absence of required software. To fix this, select a compatible program from the list. Then visit the official developer website via the provided link, download the program, and install it on your system.

The most popular programs for working with PMM files are Pegasus Mail and Aid4Mail. To get the latest version of Pegasus Mail, open the David Harris website where a universal installer for all operating systems is available.

Once setup is done, your operating system should assign Pegasus Mail as the default app for PMM files.

Make Pegasus Mail the default PMM viewer

Changing the default program in Windows

  1. Start by right-clicking on your PMM file and selecting the "Open With" option. From there, click "Choose another app" to continue;
  2. Inside the popup window, scroll through the list of applications and specifically choose Pegasus Mail as the application to associate with your PMM file;
  3. Check the "Always use this app" checkbox and click "OK".

Change the default app to open files on Mac

  1. Right click or use Control + Left Click on the desired PMM file to access a dropdown menu of actions;
  2. Select "Open in application" and click "Other";
  3. Scroll down to the bottom of the window, where you will find the "Enable" menu. Default, "Recommended Programs" will be selected;
  4. In this menu, choose "All Programs" and navigate to Pegasus Mail. Check the box next to "Always open in app" to make it the default program.

Convert to and from PMM

If a PMM file is difficult to handle, you might try converting it to formats such as AVI, JPG or similar, which may be easier to work with.

Please note that after converting a PMM file, some functionality may differ from the original. However, in many cases, it can be converted back to its original format.

Convert PMM to other file formats

Finding answers to PMM file problems

If you encounter issues with PMM files, don’t worry—most can be fixed with minor software adjustments. Refer to the troubleshooting tips below.

What are the signs that my PMM file is damaged?

Corrupted PMM email program files may have one or more of the following symptoms:

  • Opening or processing the file in Pegasus Mail or other programs causes instability or crashes in the program;
  • The file shows errors when trying to open it or does not open completely;
  • Unexpected expansion of the total size of the PMM file;
  • Working with the file triggers the display of error messages;

Why does Pegasus Mail quit or crash unexpectedly?

Pegasus Mail crashes can be attributed to outdated software. Make sure you have installed the latest updates for David Harris products.

A computer restart is often the key to solving numerous common problems. That’s why, it is recommended to restart the computer before making any changes to the software settings.

What methods can be used to repair a damaged PMM file?

Use a recovery program to open the damaged PMM file and navigate to the "Repair" menu item. Wait for the recovery process to finish, as it will automatically repair damaged email program files.