Hi merci! I just realized that data dumper is not appropriate to handle numbers. Extracting the numerical part of the string needs some further code to get rid off all non numerical values inside the string such as $Value1:. After that you can treat it numerical. Because of that I desided not to use data dumper. Better solution I found for me:

#!/usr/bin/perl -w
#use strict;

my $resultnow='C:/Users/user/Desktop/solution.dat';
open (FILE, '<', $resultnow) or die "$resultnow File not found : $!";
my @lines = <FILE>;

my $valuenow= $lines[9];


my @va=split(' ',$valuenow);
print $va[3];
[download]

So I am using now split. I guess data dumper is only good for "final" values or direct string output. But not for further data handling. So thank you for the fruitful collaboration. :-) That helped me alot. Best regards