What is the difference between .m and .M?

What is the difference between .m(small m file) and .M(large m file)?

[Matt J]

Nothing Matlab-related, I don't think. Where did you come across a .M file?

[HOMIN KIM]

I found it in old simulation model. old mat files are also .MAT, not .mat

[Jonas]

there is no difference, file extensions are not case sensitive

Answer 1

[Jan]

Under Windows, files are not case-sensitive in general, but under Linux and MacOS they are. For code without dependencies on the platform, Matlab uses case-sensitive function names since R2009a (as far as I remember). If .M files are accepted is easy to test, but there is no general difference to .m files, because both are simply text files.