use strict;
use warnings;
use Win32::OLE;
use Data::Dumper;

my $xl = Win32::OLE->new('Excel.Application');
$xl->{Visible} = 1;
#my $wb = $xl->Workbooks->Add;
print Dumper $xl->{Calculation};
$xl->{Calculation}=-4135;
print Dumper $xl->{Calculation};