RPK file reader (Trying to open files from Spore Hero ROM)

[EvolvedWillosaur42]

Hi,
I'm always curious about new file types and am having trouble.
So, I'm trying to find out how to open the files I extracted from the Spore Hero ROM.
Most of the files in the ROM are ending with the RPK file extension.
I'm not good at hacking games or reverse engineering. So, A hacker should help me with this.

Thanks,
Willosaur