Apparently only people with an IQ over 120 are able to figure it out ...
Keep your brain active and think about it:
2 + 3 = 10
7 + 2 = 63
6 + 5 = 66
8 + 4 = 96
9 + 7 = ????
The correct number is the password to open the attached document.
If you can open it, add your name, then save it to your files and
forward this letter with your saved document attached.