Getting rid of illegal characters in filenames

[Jamie Dobbs]

A while ago (ok maybe a long time ago!) someone gave me a piece of code 
that would go through the files in a directory (actually having it 
traverse an entire directory tree would be better) and rename any files 
that contained "illegal" characters (ie. ones Windows/DOS doesn't like).
I have since misplaced the code and would appreciate any help that 
people can give me to fix these filenames that contain illegal 
characters (such as * $ % etc).

Cheers
Jamie
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