Thanks for your query.
Well, Aspose.Cells follows MS Excel standards and specifications when rendering to HTML file format. MS Excel too generates resource folder when you render to HTML (Web page). To cope with your issue, you may try the following approaches to cope with your requirements (you may pick one):
Render only single worksheet in the Workbook to HTML file format, it will generate single file (but for one worksheet only) without the resource folder, see the following sample code for your reference:
//Load your sample workbook
Workbook wb = new Workbook("e:\\test2\\Book1.xlsx");
//Export image as bytes (base 64) as inline images
//Export active worksheet only
HtmlSaveOptions opts = new HtmlSaveOptions();
opts.ExportImagesAsBase64 = true;
opts.ExportActiveWorksheetOnly = true;//You may activate one sheet at a time.
//Save the workbook in HTML format with above HtmlSaveOptions
You may render images for different worksheets, see the document for your reference:
You may render MHtml file instead of HTML, it will render to single Mhtml file with all the resources embedded in it.
Hope, this helps a bit.