[M3devel] cm3: what are *.mc files

[Elmar Stellnberger]

What are *.mc - files?
They appear in TARGET - directories;
most of them are just called _m3main.mc but some of them have other names.

I ask because I am writing a program which should recognize and clear 
object files.
It does not seem to be sufficient to check for uppercase directories 
which are located together with an src directory.

Usually files of a specific type start with a 32bit magic;
however the mc files all have different starting sequences.

Is there still a straight forward way to recognize an .mc file just by 
its binary content?