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  1. or download this
    "C:\\windows\\file.txt"
  2. or download this
    my $filename="C:\\windows\\file.txt" ; ## or "C:/windows/file.txt" 

open (my $fh, "<", $filename) or die "Could not open $filename: $!";
  3. or download this
    while (<$fh>){
  # Process the contents of the record
...
}

close $fh or warn "Could not close $filename:$!";