Convertir XLS en XLTX

# For complete examples and data files, please go to https://github.com/aspose-cells-cloud/aspose-cells-cloud-perl/
    use strict;
    use warnings;
    use utf8; 
    use File::Slurp;
    use AsposeCellsCloud::CellsApi;
    my $config = AsposeCellsCloud::Configuration->new( client_id => $ENV{'ProductClientId'}, client_secret => $ENV{'ProductClientSecret'});
    my $instance = AsposeCellsCloud::CellsApi->new(AsposeCellsCloud::ApiClient->new( $config));
    my $format = "xltx";
    my $Book1Data = undef;
    my $result =undef;
    my @fileinfos = stat("Book1.xls");
    my $filelength = $fileinfos[7];
    open(DATA, '<', "Book1.xls") or die "file can not open, $!";
    binmode(DATA);
    read (DATA, $Book1Data, $filelength);
    close (DATA); 
    $result = $instance->cells_workbook_put_convert_workbook(workbook => $Book1Data, format => $format);
    open(my $fh, '>', "Dest.xltx") or die "Could not open file!";
    binmode $fh;
    print $fh $result;
    close $fh;