[Q] MID files (ringtones, notifications, etc.) no longer supported?

[themissionimpossible]

I've lot of music in the midi format (.mid files) used for ringtones, notifications, alarms, etc. that I have copied to my new S4 from my Galaxy S2 with JB 4.1.2.

I apparently can't play this type of files on S4 even with the standard music player, and accordingly these files are neither listed within the corresponding category (of course I've put them in the appropriate folder of sdcard: ringtones, notifications, etc.).

So has Samsung got rid of midi files with S4?
Any solution?

Thanks.