"There is an error in XML document" error in MNSP 6.0 (4317886)

When attempting to start Notes Migrator for SharePoint Designer the following error is thrown

System.InvalidOperationException: There is an error in XML document (0, 0).

When clicking on details the following is displayed for the stack trace:

--> System.Xml.XmlException: Root element is missing. at System.Xml.XmlTextReaderImpl.Throw(Exception e) at System.Xml.XmlTextReaderImpl.ParseDocumentContent() at System.Xml.XmlTextReaderImpl.Read() at System.Xml.XmlTextReader.Read() at System.Xml.XmlReader.MoveToContent() at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderOptions.Read29_Options() --- End of inner exception stack trace --- at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events) at System.Xml.Serialization.XmlSerializer.Deserialize(TextReader textReader) at Quest.NSP.Migrator.Options.LoadOptionsFromFile(String fileName, XmlElementEventHandler unknownElementHandler) at Quest.NSP.Migrator.Options.Load(Boolean includeUserOptions) at Quest.NSP.Migrator.MainForm.Main(String[] args)