This was mainly due to the fact that I wanted to change the texture within the game -
You get these 7 files once you extract a .pck file responsible for a character from this game, and I wanted to modify the .png file, which is responsible for the texture of the character. Thus, I have figured out a way to unpack it easily by using the quickBMS tool and using the BMS script that was uploaded online, but now what should I do to re-package it? I am totally clueless and lost- is anyone able to guide me how to work on compressing the changed contents back in to a single .pck file? Thanks for reading this long thread.

Here is the sample character .pck file, which I have been struggling to compress after decompressing it:
http://www.mediafire.com/file/00x7f4x78gci05u/c057_02.pck
Attatchment of pck file was not allowed, so I uploaded it on mediafire.
P.S: MIGHT BE RELATED TO THIS POST http://zenhax.com/viewtopic.php?f=9&t=3333&p=18521&hilit=destiny+child#p18521