System files exploration help

[Get_Homebrewed]

I've just been snooping around some internal files and I've ran into a few oddities.
First off there are two files "splash.z" and "sound.z" that I cannot figure out how to uncompress and I'm curious as to what they have inside (probably just the Wii u intro and some sound effects?)
Secondly while most applets have their songsas bfstm and are easily listenable, the download manager only contains bfseq inside it's bfsar file.
If anyone knows more about these files I'd love to hear about it!

 

[godreborn]

best bet with unknown or weird file extensions is to look at the magic in a hex editor. that might help, then if you still don't know, try googling/searching around for files with the same magic.

 

[V10lator]

What you could also do is look what Linux says about these files. Linux doesn't care about the file extension but uses mime magic and other tricks to detect the file type.

//EDIT: Other that that .z highly sounds like something compressed (zip, 7z, gz, bzip2, ...) but that's just guesswork.