how to get cache file name in arabic language

I am developing a website in Arabic language, i need to use a slug in Arabic characters but my problem is that the cache file name show characters like Ù«, ØÃ, ì, ù, à in place of normal characters.

example :

post_من-نحن ==> the slug is: من-نحن

post_٬مŠ-ومدØ٠ع-كمروي-ÙÙŠ-تØرÙات-ااØ

so how to do to get a cache file name in arabic language ?

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