files need to be placed in your baseq3 folder....

If you Quake was installed from disc,
it is located here....

 c:\program files\Quake III Arena\baseq3


or here if your Quake III Arena was purchased throgh Steam....

 c:\program files\steam\steamapps\common\Quake III Arena\baseq3


For 64bit OS, replace "c:\program files" with "c:\program files (x86)" 