question (me are noob). im using 3.90 m33-2

1. is nightPR.prx and nitePR.prx are different file types?
2. killzone.prx ? what is that for ?

i awlays ended up in freezing off after i turned on the codes on killzone with nitepr. i dontknow why. i've delete any other prx, but still nothing happen after i turned on the codes. everything is fine on coded arms contagion with nite pr codes. help me. am i getting punk'd ?