Notes about the M4 file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The M4 file type is primarily associated with 'm4'.
m4 is a macro processing language designed by Brian Kernighan and Dennis Ritchie.
The name m4 stands for macro, i.e., m plus 4 characters. A macro processor (or a preprocessor) is a text-replacement tool. Its chief use is to re-use text templates, typically in programming applications, but also in text editing, text processing applications.
Typically lower case on *nix systems.
Detailed information for file extension m4:
Hex: 64 6E 6C , ASCII: dnl
Other applications associated with file type M4:
- Meta4 (Source Code) by Meta4Meta4: provider of human & intellectual capital management software.
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database
To change file associations press Windows Key
and then Apps and Features
> Default apps
> Choose default apps by file type
Invalid file associations could be the result of underlying issues within your Windows PC.