first, you don't do

      msoFalse, # link to file
      msoTrue,  # save with document
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Those become string constants.
So start with use strict; to diagnose those better.

Better do:

    my $wordconst = Win32::OLE::Const->Load($word);
    $wordconst->{msoFalse};
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Yet, don't do mixed style OLE calls, like in your 'SaveAs' method, it is not supoprted.