bazzert,
Don't listen to Molski. Why spend hours trying to beat your friend when you can make him mad in a couple of minutes. You wil need a hexadecimal editor, I guess you could do it on the wizard but it's easier on your PC with ultraedit or whatever you use. As you correctly guessed the high scores are stored in \windows\bubblebreaker.dat. Make a copy of it somewhere in case you mess it up badly...Open the file in your hexadecimal editor
You have to write down your high score, your average and the number of games. Let's say that your high score is 1732. Convert it to its hexadecimal value : 06C4. You have to look for the hexadecimal string x'C4060000' (notice the inversion : 06C4 has become C406) now, you think that you deserve 10000 points : 10000 = 2710 so just replace C4060000 by 10270000. Right, your high score has been taken care of. Now, let's multiply your average score by the number of games you played. You will get the total amount of points you scored. You score an average of 500 points and you played 10 times so 5000 points (88130000) that's the 4 bytes next to your high score in the .dat file. It's up to you to decide if you wish to change it to reflect your new score or may be you want to show that you score over 5000 points on average...
I will try to attach a copy of my Statistics. After only 3 games I have a high score of 10000 points using this method...
good luck!