What does it matter whose wallet it is? After all, I have the dat file. all we have to do is crack the password? if this is possible i will give half of the coins inside the wallet.
When you come here and ask for help, at least be kind and honest. That's not your .dat file and I even bet you bought it, so, congrats, you got scammed. If you want to recover that wallet's password, you should have a look at this guide that's written by our forum member:
Bitcoin2john: the reliable cracker that will break wallet.dat files.