Pegasus Mail message folder index
File type: Email related data file
A pmi file extension identifies an index file used by Pegasus Mail, an e-mail client for Microsoft Windows.
A pmi file is associated with a Pegasus Mail message folder and helps the software locate messages stored in the corresponding mail data file.
Found 2 different file type records with the same pmi filename suffix.
File type category:
Email related data file
Date updated: November 6, 2026
Pegasus Mail, developed by David Harris, uses pmi files as indexes for its message folders. The index is normally stored alongside the file that contains the actual messages, which are stored in a more compressed form.
The pmi file records the positions of messages in the associated mail folder data file, allowing Pegasus Mail to find and display messages without scanning the entire folder each time. It is therefore a supporting file rather than a standalone mailbox.
The format is used by the Microsoft Windows version of Pegasus Mail. Aid4Mail can also access Pegasus Mail mailboxes and export their messages to other formats.
Open the associated mailbox in Pegasus Mail on Microsoft Windows. The pmi file is an index and normally should not be opened by itself; keep it with the corresponding Pegasus Mail message data file.
Aid4Mail can access Pegasus Mail mailboxes on Microsoft Windows when the messages need to be read or extracted.
A pmi file is an index, so it is not normally converted on its own. To convert the messages it indexes, open or import the complete Pegasus Mail mailbox in Pegasus Mail or Aid4Mail, then export the messages to a supported mail format.
Software applications that can open pmi files:
Microsoft Windows
Software applications that can edit pmi files:
Microsoft Windows
Software capable of saving pmi files:
Microsoft Windows
Software apps that create pmi files:
Microsoft Windows
Software apps that backup pmi files:
Microsoft Windows
File type category:
Various data file
Date updated: March 29, 2019
Record marked as obsolete and not updated for a long time.
The pmi file extension was also used for one for the files in OS/2 operating system.
Program manager information file. Much like the OS/2, it is old and not longer used file type.
Software applications that handle other tasks involving pmi files:
Other operating systems or devices
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