The current version of File Format Converter in Biomedical Toolkit does not support convert annotations to EDF.
Sorry for that. Why do you want to convert to EDF? Can you directly use TDMS?
Thanks for the promt reply. I need EDF so I can open it in a specialzed EEG software (Persyst) which does not take TDMS. In fact no comercial softwares (Persyst, Curry, Profusion) are working with TDMS. I think you shoud not have advartised the file conversion tool to be able to convert from TDMS to EDF or at least be very clear that it does not support main features such as annotations.
Sorry for the inconvenience. Actually, Biomedical Toolkit utilizes the dataplugins shipped by NI to support EDF - http://www.ni.com/example/27642/en/ You could request this new feature here http://www.ni.com/downloads/dataplugins/.
For the current situtation, is there any other format they could support to load annotations? For example, more general format - csv. Then you could read the annotations converts to csv in LabVIEW.