Dear Shun-Ichi,
Thank you for your detailed reply. My first try to re-build WS with the new libmysql.dll did not lead to a new libwsmysql398.dll appearing in ws\lib. I am listing the errors appearing during the re-building step and will send them to you as soon as possible.
One other question : I do not understand how WS could find the mysql header files located in others\mysql\include as the compiling tab in project settings specifies -I. -I'$(WSDIR)/include' in include path field.
Sorry to disturb you with these problems but I really find WS very interesting and I would like to be able to develop databases applications with it under different OS like Win98/XP/2000 and Vista.
Waiting for reading your comments,
Best regards