Problem on MPC live with The special character, keyboard

Hy,

When i export waves from my MPC live, i want to give them Names with special Characters.
I can see them on the Display MPC live, but they are light grey, so iam not able to use them.
Do i do something wrong ?
why are they there but i cant use them ?

Help

Thanks

You may be able to use them for some names, but they may not be supported on the file system. I am not sure if you can format your drive differently to get support.