That is correct. However I would reccomend importing the Excel constants via

    #Load a hash reference to Excel's constants in the scalar ref $xlC
+onst 
    my $xlConst = Win32::OLE::Const->Load('Microsoft Excel 8.0 Object 
+Library');
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and using $worksheet->Cells(1,2)->{HorizontalAlignment} = $xlConst->{'xlRight'};