>> M3J file

M3J file format description

Many people share .m3j files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .m3j file can be edited, converted or printed with. On this page, we try to provide assistance for handling .m3j files.

1 filename extension(s) found in our database.

.m3j - Moldex3D Solid Project

The M3J project files are related to Moldex3D. The M3J file is a Moldex3D Solid Project. Moldex3D is a powerful simulation tool to help evaluate the performance of 3D printed injection molds.

Project files
- / -
Moldex3D Solid Project related extensions:
Moldex3D Batch Job Settings Data
Moldex3D Shell Project
Moldex3D eDesign Project

Naturally, other applications may also use the .m3j file extension. Even harmful programs can create .m3j files. Be especially cautious with .m3j files coming from an unknown source!

Can't open a .m3j file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .m3j file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

m3, m3h, m3i, m3u, mj

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

IBM Voice Type Languages Newuser Data
M3U Playlist File
MovieJack DVD Ripper File
Palladio ModelJoin Query File
Juki AMS Embroidery Data
Modula-3 Source Code

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android

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