How to delete read-only files with Ruby commands

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All-

On a Windows NT system, is there a way to quickly delete directories (from within a Ruby script) that may have read-only files in them. The command I've been using is 

   File.delete(*Dir["*.*"])

but this crashes when it hits a RO file.

Similarly, is there a way to force the overwriting of a RO file? I've been using File.syscopy, but this, too, crashes when attempting to overwrite an RO file.

Thanks!

-Kurt Euler