I don't really know what Knight Blade is... But, I can probably help with this. If you don't use RPG Maker XP, then just ignore the rest of this. If you do, read the next part. If there is a weird thing called an "Encoded Archive" then don't try because I don't think you can open it up. If there's the game folder and music/etc. and the game can't be opened up, then just make a new project and move all the folders into that new project.