use strict;
use Win32::OLE qw(in with);
use Win32::OLE::Const 'Microsoft Excel';

$Win32::OLE::Warn = 3; # Die on Errors.

my $excelfile = 'book1.xls';

my $Excel = Win32::OLE->GetActiveObject('Excel.Application')
	    || Win32::OLE->new('Excel.Application', 'Quit')
            || die Win32::OLE->LastError(); 

   $Excel->{DisplayAlerts}=0;   

my $Book = $Excel->Workbooks->Open($excelfile) or die Win32::OLE->LastError();

print Win32::OLE->LastError();