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OLE exception from "Microsoft Office Excel":

'./test.xls' could not be found. Check the spelling of the file name, 
+and
...

Win32::OLE(0.1709) error 0x800a03ec
    in METHOD/PROPERTYGET "Open" at C:/workspace/graph.pl line 12

use strict;
use warnings;
...

my $book=$Excel->Workbooks->Open("./test.xls");
my $sheet=$book->Worksheets(1);

use strict;
use warnings;
...
    $row++;
}
$workbook->close();