You absolutely can open a file for writing when use strict is on effect. Try the following code to prove it:

#! /usr/bin/perl

use strict ;
use warnings ;
$|++ ;

open OUT, '>out.txt' or die "Couldn't open the file: $!" ;
print OUT "Hello, World!\n" ;
close OUT ;

exit ;

__END__
[download]

_______________
DamnDirtyApe

Those who know that they are profound strive for clarity. Those who
would like to seem profound to the crowd strive for obscurity.
            --Friedrich Nietzsche