You can't open this .u Try to check this package with UTPT software to take a list of effects, you need years and knowledge to know how it works and how maybe to edit it.
You can check effects lists and use them in soulshot.int like LineageEffect.FX_NAME
But if you need cool and new soulshot effects then write me in discord or Skype and I will show you how it works and some new styles so that you have a better idea of them.
I don't recommend to add some very huge effects because in mass PVP you might have problems with FPS or etc. It is important to understand how it works, what effects to develop so that they are not huge, but at the same time to be beautiful.