If you want to use the MD2 model for Klonoa in OpenGL mode:

1. Open the KDLC folder within this .zip, copy the files from it to this location in your SBR2K game's folder:
..\SBR2 Kart\mdls\KDLC

2. Find the "mdls.dat" file found in the root of your SRB2 Kart game folder, open it with any text editing program (ex Notepad), and add this line
to it: 

KLONOA KDLC/KKLONOA.md2 3.1 0.0

after adding the above line, click 'save' and have fun!