problem with DATA_CORE.wad

hi i'm new here on this topic.I tried to mod my Dotp2012 game but at the first step(as descripted by your beginner's guide viewtopic.php?f=65&t=3745)when i try to unpack DATA_CORE.wad at one point of the unpacking it stops and give me an error;i tried all the compability(my Operative system is windows 7) but it always stop at the same line...(ah i'm using gibbed tools)
What i have to do?thank you and good game
What i have to do?thank you and good game
