help needed in phrasing a requirement

I am in the process of writing a Requirements spec. In that I have a dilemma in phrasing a piece of requirement

Scenario: We download files from a website and the downloaded files need to be attached to an item in the CM tool we have

The downloaded files contain names which can be AsCII, ISO-8859-1, Japanese etc

Does phrasing as below covers all situation?

The downloaded file name may contain non-ASCII characters and processing of this shall not crash the application