Help with a .pack?

[Interconnect]

Hello, and hopefully I'm posting this in the right section. So the mobile game, MikuColle, used to have someone who would upload the extractions of the game shortly after the game updates, but has recently stopped, and so I'd like to continue on it. However I'm fairly new to all.

So using this bms script on the game's .pack file, I got a file named CAB with a bunch of letters and numbers without an extension and from here I'm pretty much lost.

I've attached a sample file as well

Thank you very much for your time.

[aluigi]

The next step is using the unity script:
http://aluigi.org/papers/bms/unity.bms

You will obtain various files, there are some people on this forum that can give you some hints about opening them so let's wait what they say.