[AndyD]

Сталкивался с этим

А если так?

static void MVB_Excel_DocProperty(Args _args)
{
    COMExcelDocument_RU     excel;
    FileName                fileName = "C:\\Пример.xls";
    COM     doc;
    COM app;

    COM Workbook;
    COM prj;
    COM comp;
    COM module;
    COM code;
    str s;
    #define.vbext_ct_StdModule(1)
    ;

    excel = new ComExcelDocument_RU();
    excel.newFile(fileName,true);
    doc = excel.getComDocument();
    app = doc.Application();
    Workbook = app.ActiveWorkbook();
    prj = Workbook.VBProject();
    comp = prj.VBComponents();
    comp.add(#vbext_ct_StdModule);
    module = comp.item(comp.count());
    code = module.CodeModule();
    s = strfmt(
                "Sub SetDocumentProperties()\n" +
                "\n" +
                "ActiveWorkbook.BuiltinDocumentProperties(\"Author\").Value = \"%1\"\n" +
                "ActiveWorkbook.BuiltinDocumentProperties(\"Creation Date\").Value = CDate(\"%2\")\n" +
                "With ActiveWorkbook.CustomDocumentProperties\n" +
                "    .Add Name:=\"Автор\", _\n" +
                "        LinkToContent:=False, _\n" +
                "        Type:=msoPropertyTypeString, _\n" +
                "        Value:=\"%1\"\n" +
                "    .Add Name:=\"Дата создания\", _\n" +
                "        LinkToContent:=False, _\n" +
                "        Type:=msoPropertyTypeDate, _\n" +
                "        Value:=CDate(\"%2\")\n" +
                "End With\n" +
                "\n" +
                "End Sub", 
                (select UserInfo where UserInfo.id == curuserId()).Name,
                date2str(today(), 123, 2, 2, 2, 2, 4)
              );

    code.addFromString(s);
    app.Run(strfmt("%1.SetDocumentProperties", module.name()));
}