Probably not but you won't benefit from it retroactively, you'll only get runes for the battles you haven't fought yet.

true, you will get runes only from future battles, and no restart is required:-P

um.... Could you please tell me how to open these file as text files?

Open With -> Choose Program... -> Notepad/Wordpad/Other

OR

Double click on the file -> Select the program from a list -> Notepad/Wordpad/Other

LUA is a text file, KFS is an archive file.