Why are font names being renamed to Gen_[fontname] in EPS files exported from FreeHand?

TechNote: When exporting EPS files from Macromedia FreeHand with the “Include fonts in EPS” option selected, the embedded fonts will be renamed. For example, the AvantGarde font will be renamed to Gen_AvantGarde. This will cause some applications to ask for these fonts when importing the FreeHand EPS file.