Final Fantasy Hacktics

Did you install Java correctly? I'm on windows 11 and I had to use jarfix to be able to open the old editors correctly

here is the author site where you can download it: https://johann.loefflmann.net/en/software/jarfix/index.html#Download

What happens to enemy's movesets if you edit jobs' abilities?

Like say, I delete Viking's Pickpocket and then add Water. Will enemy Vikings with Pickpocket (Lord Grayrl for example) still be able to use Pickpocket, or will Pickpocket be replaced with Water?

They will keep using Pickpocket, it is the ID of the ability that matters ^^