You'll need something like unluac to decompile the alb file into lua code.
If you have the file loot.alb, you run it from the command line like such (with loot.alb in the same directory as unluac.jar)
Code:
java -jar unluac.jar loot.alb > loot.lua
If you want to replace the .alb then you'll need to do a few more steps: Always have a backup of your unmodified game_pak
- Edit your new lua file and make whatever changes you want
- Find out the size of the original .alb file in bytes
- Pad out the lua file with -'s to increase the size (i.e. ---------) until it is the same as the .alb, or trim out other parts where you can to reduce the size
- Rename the .lua to .alb and import it back into your game_pak