The files like 12F683.BAS are meant to be left alone. You should be naming your own file xyz.bas or xyz.pbp, or any name to your liking (that does not exist in PBP). Hopefully you made a copy of the file so you can restore 12F683.BAS back to normal.

You may sometimes have to edit some configs in files like 12F683.inc, but changing configs should be it. Don't write a program there.