Error when attempting to use new Pak3 files

[Cornbread]

I've been playing around with trying to edit single player aspects of the game. However, whenever I try to add a new pak file, the following error occurs when the game is started:

 

ERROR: filename length > MAX_QPATH ( strlen(Program Files/LucasArts/Star Wars JK II Jedi Outcast/GameData/base/models/weapons2/saber/saber_w.glm) = 100)

 

Anyone able to shed some light on what I'm doing wrong?

Thanks.