PM means Private Messages ... on this forum. Look for the 'Bell' icon top right corner.
I sent you a URL to an article you need to read ... because ...
The only file you will see in moodledata/filedir/ that is humanly recognizable is the 'warning.txt' file ... do read it. All of what you see in moodledata/filedir/ is really created and controlled by code talking to your DB for your moodle ... mdl_files table.
This query will get you a peak ...
select contenthash,filename from mdl_files where filename like '%.mbz';
The contenthash value is really the location and filename in moodledata/filedir/ - the filename column in that table is the humanly recognizable filename - the one you see in moodle if you could get to moodle. In your case, you can't!
And ... Internet has never really been a 'friendly place' thus anything serving anything is 'game'.
'SoS', Ken