Yes, it is resolved the “System.text.encoding.codepages” errors.
but pdf file is not opening. also if we set the property as fileformatetype.unknown then it is not showing the image icon for zip, jpeg, msg format types.
Please find the attached poc also excel sheet which has generated using 20.2 version.
AsposeAttachmentsPOC_v21.2.0.zip (897.7 KB)
2021-09-2–13-27-25Result.zip (867.9 KB)