I poked my nose into some of the files.
kill.log uses unknown encryption.
LOG and LOG2 are truncated, I.e. don’t go back to day 1. Same with msglog.txt
I might be out of luck. Well, got to go kill another ~50 Njerpez.
EDIT: ignore my message below and just see the one above.
Night's done much better work and explanation. I started typing this message, went to dinner, came back, hit post and then noticed a better answer than mine, right above my post!
I don't think it's encrypted (although it does look encrypted when looking at it in a text editor in ascii mode). I do not have a perfect solution for you but depending on how much time you wish to invest into reverse engineering the kill.log data storage layout, I might have a starting point for you.
//prep work
-make a copy of kill.log
-open the copy of kill.log in Notepad++ text editor (if you don't have it, you could either download & install it or just "unzip" the portable edition -- it's free software)
//step: convert hex file to ascii
-in Notepad++ search & replace tool (CTRL+H) > replace ' ' with '' (i.e.: replace single-whitespace-char with nothing)
-select everything CTRL+A
-use Plugins > Converter > HEX -> ASCII
//step: cleanup ascii file (just a bit)
[ Note that this step could also be read as gutting the file, if you have any interest in reverse engineering the file format this may not be the best idea but for learning purposes, on a copy, perhaps do it once. ]
-use Notepad++ search & replace tool > enable extended characters > replace \x00 with <nothing> to get rid of 'NUL' chars
-now, keep open that CTRL+H screen and just delete the last digit of SEARCH FOR string "\x00" and make it "\x01", click replace all
-keeping replace window open, and as per last step, manually changing the last character of the search-for-string in light of the table below, keep replacing all the ascii symbols in the file with nothing, effectively shortening and simplifying the content ( more info on symbols is in this table:
https://www.december.com/html/spec/ascii.html )
//ascii symbol names
SOH start of heading \x01
VT vertical tab \x0b
NUL null \x00
RS record separator \x1e
ETX end of text \x03
ENQ enquiry \x05
SO shift out \x0e
SI shift in \x0f
BEL bell \x07
DC1 device control 1 \x11
DC2 device control 2 \x12
DC4 device control 4 \x14
STX start of text \x02
ACK acknowledge \x06
EOT end of transmission \x04
BS backspace \x08
FS file separator \x1c
FF (NP) new page/form feed \x0c
NAK negative acknowledge \x15
ETB end of transmission block \x17
HT horizontal tab \x09
US unit separator \x1f
SYN synchronous idle \x16
---
//in this kill.log file there are also characters with hex value hh (\xhh)
ref: see the converter here
https://www.rapidtables.com/convert/number/hex-to-ascii.htmlx80
x8D
x99
x99
x9A
xBF
xC8
xD2
xD3
xD4
xE3
xE9
xEC
xEE
xF0
xF4
xF9
xFA
xFF
--
Eventually you'll have something that might give you a kill count.
Testing this on a new character/save with only one or two kills would probably help understand the data storage format better.
Also xmas is coming maybe the devs will give us an in-game kill.log export function or a simple external utility.
good luck