how to edit xxcrt.o?

i'm trying to edit some courts but i can't open the xxcrt.o file with oedit.. the prog says its not a valid .o file for some reason. can anyone tell me how i can edit it? thanks..

you should extract the file with eagraph, and when it ask you if you want to descompress it click yes, then it will be editable

ok thanks for the help!