I think the lack of response is because the question is not specific enough. What kind of help do you need? Here are some questions that would help us proceed:
Is it a 2D drowing or a 3D model?
Will the IGES file NOT open in AutoCAD?
Will it open but with errors?
Does it open but some of the data appears to be missing?
Does it open but the data look disconnedted (3D surfaces)
Does it open but you can't see the data at all?
Does the file open in another CAD system?
Have you asked those providing the IGES file to try sending you a new one?
So you see, nobody knows where to begin answering your question. Please provide as much specific information as you can.