A couple of things here:

1. $file is not the current item in the @files array.
2. The function call will not work inside the quotes.

This is untested, but I'd go with something more like this:

my $file = '.' ;

opendir( DIR, $file ) ;
@files = readdir( DIR ) ;
close( DIR ) ;

for ( @files )
{
    if ( /\.HTM[L]?/ )
    {
        system("rename", $_, lc( $_ ) );
    }
}
[download]

Or, even better (if it's supported on NT), just use Perl's rename command.

rename $_, lc( $_ ) ;
[download]

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