>If we're talking about file names, some characters are not valid, and others are effectively duplicates e.g. "A" and "a" are the same because Windows file names aren't case sensitive.
>
>A better estimate is 10 digits 0-9 + 26 alphabetic chars, or 36 total chars.
>
>36^5 is about 60 million.
I would agree with John R, you are not taking into account UNICODE support for the file names, or even simple valid characters like ñúóéáí etc. (oh, and the space!)
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