aspose.words.saving.HtmlSaveOptions class. Can be used to specify additional options when saving a document into the [SaveFormat.HTML](../../aspose.words/saveformat/#HTML), [SaveFormat.MHTML](../../aspose.words/saveformat/#MHTML), [SaveFormat.EPUB](../../aspose.words/saveformat/#EPUB), [SaveFormat.AZW3](../../aspose.words/saveformat/#AZW3) or [SaveFormat.MOBI](../../aspose.words/saveformat/#MOBI) format...SaveOptions ) metafile_format Specifies in what format metafiles are saved...HtmlMetafileFormat.PNG , meaning that metafiles are rendered to raster PNG...