filename.src prefix size

Hello,
I noticed this systematic issue on build 0.7.7

If I edit 12345678.src (to create this file and edit), there is no issue

If I edit 123456789.src (to create this file and edit):
RESULT: we are blocked (keyboard)
EXPECTED: error message on screen is returned and keyboard not blocked

Remarks:
I did not see in the manual 1.0 Rev E this size limitation. But we can guess.
After roughly 30 seconds, text editor opens ??? with file 123456789.src displayed; but we cannot save

Indeed the file system is the classic FAT32 format using 8.3 name convention (same as MSDOS).

I will mention it in the next manual revision.
I will add a test to avoid the system hanging. (note that every time I add tests in the OS it takes memory and reduce the ability to add new features in the future).
 

Thank you Franck.
mkdir protection is made related directory >8 cars.
It returns: file error!