At the start of FrameMaker the site dictionary is (if old format: converted and) imported to C:\Users\User\AppData\LocalLow\Adobe\Linguistics\UserDictionaries\FMSiteDictionary\all\added.txt. This replaces the previous content. The transfer, however, does not take over hyphenation points. This is independent of format (old, new, with/out header). They are set anew and may create very strange results - just an example:
Word in the site dictionary as deined in maker.ini: Gesamt-farb-s\x8at-ti-gung
Word in the 'internal' dictionary file : Ge¦s¦a¦mt¦far¦bsätti¦gung (the ¦ depicts the hyphenation code \x02)
This makes it impossible to maintain the site dictionary.