It depends.
If you want to have a so called "online-highscore" I doubt you will get around a MySQL database.
Take a look at these threads:
MySQL.dll:
http://www.coniserver.net/ubbthreads/showflat.php/Cat/0/Number/489090/page/0/fpart/1/vc/1

Online Highscore by Poke_Smot:
http://www.coniserver.net/ubbthreads/sho...true#Post640823

If you don't want an online highscore but a local highscore you could just write the information into a text file.
Problem is: User would be able to change their highscore if its a plain and easy to read .txt file.
This can be prohibited by some encryption, but for a small simple game this would be too laborious.

Hope I could help you out a bit
Have fun with 3DGameStudio and welcome to the community!