Aspose::Words::Saving::HtmlSaveOptions::get_ExportCidUrlsForMhtmlResources method. Specifies whether to use CID (Content-ID) URLs to reference resources (images, fonts, CSS) included in MHTML documents. Default value is false in C++....documents are referenced by file name (for example, “image.png”)...where references to resource files are written as CID (Content-ID)...