Can anybody please help me to unpack and dissasemble a file. I have tried all the file analysis to try and detect what type of security sytem it is using and non of them can reconise it. Is it possible that the original programmer has created there own security sytem. I have tried opening the file using IDA Pro 4.0 but it only opens a small sample of code and the rest is comes up unexplored.

Any help will be most appreciated, as I have spent nearly 2 weeks trying to crack the file and got no where.