Defaults the characterset encoding to UTF-8 (#6) This change allows converting files with filenames that are not present in the current US-ASCII charset With the current US-ASCII charset, the error ´java.nio.file.InvalidPathException: Malformed input or input contains unmappable characters: Ødegaard.docx´ is thrown when trying to convert files with UTF-8 characters (like Æ, Ø and Å in Norway)