How top open CUBE files in hitfilm express 4

Hey guys, how is everyone! hope you are doing great.

I have a question and i hope you can help me, i am totally new to this film making. Started to learn and it's going pretty ok. Now my question is about LUT'S, i found a lot of free lut websites and everytime i download a package it's al in CUBE files. And for some reason i can't seem to open them. Anyone any ideas on how to open .cube files?

Thanks guys!!!