The texts are gibberish when you start a new KAG project.
The ks & tjs files are supposed to be in human readable formats, so you can open it with your text editor. But you won’t recognize things on scrambled ks & tjs files.
If you open the file in hex editor application you will recognize the scrambled scenario file by the following signatures:
FE FE 00 FF FE FE FE 01 FF FE FE FE 02 FF FE
There is a tool to descramble / decrypt such files. You can download the tool here : https://github.com/arcusmaximus/KirikiriTools
What you need is KirikiriDescrambler.exe
KirikiriDescrambler turns these into regular text files which can be placed right back in the game – no rescrambling needed.