MEF File

What are MEF files and how to open them

Are you having problems opening a MEF file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a MEF file?

MEF files have multiple uses, and Camera RAW Image File (Mamiya) is one of them. Read more about the other uses further down the page.

Camera RAW Image File (Mamiya)

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open MEF files

We have identified two MEF openers that are compatible with this specific type of MEF file.

Programs that open Camera RAW Image File (Mamiya) files

Last updated: January 22, 2023

More file formats using the MEF extension

Through our research of MEF files, we know that the following formats exist. However, we have not yet analyzed them in detail.

  • MAIET Encrypted File System
  • Mirror II Emulation File

Various apps that use files with this extension

These apps are known to open certain types of MEF files. Remember, different programs may use MEF files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Picasa Photo ViewerPicasa Photo ViewerDiscontinued
Adobe PhotoshopAdobe PhotoshopUser submitted
PhotoPad Image EditorPhotoPad Image EditorUser submitted
HoneyviewHoneyviewUser submitted
Corel PaintShop ProCorel PaintShop ProUser submitted
Zoner Photo StudioZoner Photo StudioUser submitted
RAW Thumbnail ViewerRAW Thumbnail ViewerUser submitted
PixillionPixillionUser submitted
PicosmosToolsPicosmosToolsUser submitted
PhotoStudio DarkroomPhotoStudio DarkroomUser submitted

Help us help others helps thousands of users every day, and we would love to hear from you if you have additional information about MEF file formats, example files, or compatible programs. Please use the links below or email us at to discuss further.