From printf documentation:

Don't fall into the trap of using a printf when a simple print would do. The print is more efficient and less error prone.

#!/usr/bin/perl

use 5.010;
use strict;
use warnings;

# open for write, append
open(my $fh,'>>','c:/temp/test.txt')or die "Can't open file: $!\n";   
+ 

print $fh "\n[ARTEC]\n".
          "IniFile=f:\\vaa\\basis\\vaa01.ini\n"
close($fh);
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