I getcha now. Nero burning ROM will normalise levels between tracks when burning audio CD's but I'm not sure if that will work if it's a 1 hour .wav file. The only other thing I can think of is using a compressor/limiter with the peak level (allowed to pass through) set at the lowest gain of the material going through it if that makes any sense. Problem with that method is, you'll need to either guess what the low gain is or go right through the material to find it, maybe set the limiter with an output level or peak at 0 db and pass the material through it.
Can't guarantee that's going to work either because I've generally only used that method on say a bass guitar track that might be perfect with a few level problems in it because someone got heavy handed whilst recording