I am using version 25.2.1 of GroupDocs.Conversion. When I attempt to convert a ICO file to PDF, I get the following stack trace:
java.lang.RuntimeException: class com.groupdocs.conversion.exceptions.FileTypeNotSupported…...html, mhtml, mht, doc, docm, docx, dot, dotm, dotx, rtf, odt,...to PDF combinations. (.pptx, .docx, .png, .jpeg to name a few)...