Please dont turn this into a GW/clones/malware war!! I have a doubt, im not an engineer. Some people answered me that a launcher.dat even if has very little parts corrupted, i wont work at all. And i've seen some others that stated that third MD5 check doesn't match the genuine launcher but even that it works. as far as i understand the MD5 test checks the integrity of the file as a whole, so if the MD5 fails, then the thing is incomplete and/or corrupted and shouldn't work, but it's working in some cases. How is that?