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'''-d "C:" && ! -d "./C:"'''
This expression determines whether a directory called '''C:''' exists and--if it does--verifies that it is '''not''' a subdirectory called "'''C:'''" deliberately created by some wag for the sole purpose of defeating the check. Since, of course, one occasionally encounters a Windows system that does not feature a '''C:''' drive, the expression can be generalized thus:
'''join "", map { -d $_ && ! -d "./$_" } map { chr( $_ } . ':' ) ord( 'A' ) .. ord( 'Z' )'''
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