Microsoft Mail message
File type: Internet related file
Files with mai file extension could be found as saved e-mail messages in old Microsoft Mail program.
Found 3 different file type records with the same mai filename suffix.
File type category:
Internet related file
Date updated: December 30, 2024
Record marked as obsolete and not updated for a long time.
The mai file extension is related to Microsoft Mail, an older mail server program for early versions of Microsoft Windows operating system.
The mai file contains saved e-mail message. Might be a little old format and no longer used.
Software applications that handle other tasks involving mai files:
Microsoft Windows
File type category:
Internet related file
Date updated: August 19, 2019
A mai file extension is related to the Pegasus, an e-mail solution for various operating system.
These sub directories represent old-style message directories, from the early releases of Pegasus Mail. The use of these nowadays is in relation to system wide folders (called Public folders from version 4.20).
The folder directory must contain a file called PMFOLDER.ID, which is a single NULL-terminated line representing the folder's long name. More information in the WGUIDE.HLP file in the program directory.
Probably not meant to be accessed by the user.
Probably cannot be converted to anything else.
Software applications that can open mai files:
Microsoft Windows
Software apps that create mai files:
Microsoft Windows
Software applications that handle other tasks involving mai files:
Microsoft Windows
File type category:
Graphics file
Date updated: September 22, 2026
The mai file format is a proprietary format used by Sony video-recording devices. A mai file contains a small preview image that represents a related video, rather than the video data itself.
On compatible Sony media, the mai file is stored with the corresponding MQV movie file so the device can display a thumbnail when browsing recorded videos.
A mai file is normally used automatically by compatible Sony equipment and is not intended to be opened separately. Keep it with the related MQV movie file when copying or restoring recordings to the device.
The mai file is a device thumbnail rather than source video or a conventional image intended for editing, so it has no usual conversion workflow.
To obtain a usable image, extract a frame from the associated MQV movie or create a new thumbnail in image software.
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