I HAVE extracted The Mummy Isolated Score from it's DVD. It is in AC3 file format, 5.1. I also saved it in PCM format. By CD standards it is lossless.
General
Complete name : I:\Blu-ray\The Mummy (HD-DVD Remux)\The Mummy ISO Score.ac3
Format : AC-3
Format/Info : Audio Coding 3
File size : 308 MiB
Duration : 1h 36mn
Overall bit rate mode : Constant
Overall bit rate : 448 Kbps
Audio
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Duration : 1h 36mn
Bit rate mode : Constant
Bit rate : 448 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 308 MiB (100%)