Binary file question

[Cannibal]

Hi,

I've got to make a file that contains information about the behaviour of a user (some kind of log file). But when I write the data into a file and open the file in notepad, you can still see the data and even change it. Is there any way that I can write a file, like in C++, so that it's impossible to see the data in notepad?

Thanx in advance

[Loriken]

encrypt it. But users will still be able to muck it if they wish.