Mobile- Gangstar Vegas .g4 files?

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I found a file in this mobile ios game named "sounds.g4" and I have NO clue how to open. Any ideas? Here's the file:
http://www.filedropper.com/sounds_2
Just press the "Download File" button.
Any information on how I could possibly decompile the file into the individual sound files, or any other leadway on how to view it would be great, thanks!
~Anex

Recap:
Platform: iPhone(ios)
Game: Gangstar IV- Vegas
File Type: .g4

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UPDATE:
I managed to find a QuickBMS script that unpacked all the files! Now, I have a bunch of .mpck, .vxn and .lwav extensions. I'm positive these are the sounds. I can't seem to find anything on unpacking them. Now, these 3 samples of each of the files I will be uploading have a hexidecimal offset. I believe it's big endian, but I don't know if that information is relevant or not. I've uploaded down below. I REALLY need help, as we will be the first people to ever crack this game's encryption. Thank you!
~Anex

EDIT: Here's the samples link:
https://files.fm/u/m5e4ztvx

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Sorry to bug again... but I think that these files are offset files and may have some type of tool to extract them... I just don't know where...