// search for the first available alternative of the embedded file
        PDEmbeddedFile embeddedFile = null;
        if (fileSpec != null) {
            embeddedFile = fileSpec.getEmbeddedFileUnicode();
            if (embeddedFile == null) {
                embeddedFile = fileSpec.getEmbeddedFileDos();
            }
            if (embeddedFile == null) {