Some video playing programs create association for .dat files, i think somtimes they are videos, but in this case it's not a video, don't even try opening the file (some video programs have functionality to fix corrupt videos, there is the risk the program will mess up your wallet if you try to open it, just leave it where it is)
That's ok.
That's finally done right now. My bitcoins are in my account. status: 59 confirmed. 142590 blocks.