Aspose.Words.Saving.OoxmlSaveOptions class. Can be used to specify additional options when saving a document into the [SaveFormat.Docx](../../aspose.words/saveformat/#Docx), [SaveFormat.Docm](../../aspose.words/saveformat/#Docm), [SaveFormat.Dotx](../../aspose.words/saveformat/#Dotx), [SaveFormat.Dotm](../../aspose.words/saveformat/#Dotm) or [SaveFormat.FlatOpc](../../aspose.words/saveformat/#FlatOpc) format...or not to use ZIP64 format extensions for the output document....class suitable for the file extension specified in the given file...