dear netters: please tell me how I can use the file in FDAT format (got from CSD ) as input file to MAC MIMIC or CHEM3D.It seems to me that I need to change some "heading" of the FDAT file in some way (use a text editor) in order to adjust the NEW environment in MAC MIMIC or CHEM3D....but I don't know the "skill" ! help,help! cheers