The VG Resource

I have extracted the contents of a DS rom, and it returned me some files with the NCGR.lz extension. How do I do to view those file's contents?

Sounds like it is a simple lz compression. Try opening the DS rom in Tinke, and you should be able to decompress and view the files in there.

d - decompress file
spacebar - view file as recognized file type
p - " " palette (NCLR)
t - " " tile (NCGR)
m - " " map (NSCR)

For NCGR files, you will need to open a palette first.

Which game is this for?

Tinke looked way too complicated, but I managed to open them with Console Tool.

It is for Giana Sisters DS