thanks anyway - i will try to solve this for myself. Message of a new topic is already working. This is what i have done:
Process is like this:
new_topic_form.asp
=> Form to new_post.asp
=> line 151 - still UTF-8
=> line 395 - still UTF-8
=> line 519 - still UTF-8
=> line 792 - still UTF-8
- so it must be on the database or the sql statement.
Action: Changed for "message" table "tblThread" the data type from old:
text to new:
ntextResult: Message of a new topic will be stored correctly as utf-8 !

Will keep you upToDate with the memberAPI. (username is not going as utf-8 into the database.
regards
Sebastian