All text files have a header:
0x1 0x1 0x20 0x10
Starting at file 30776, begin the SARC archives.
File 70, 71, 72, 73, 74, 537 are font graphics.
Compressed archives have a structure:
uint32 size uncompressed chunk
uint32 chunk count
uint32 uncompressed file size
For I to chunk count
uint32...