Please try to read other topics,or if you're a lazy ass like me.Then your question How to open squirrel files
*Squirrel files are mostly .nut,if you have some other extension,i don't know then :p
*You can use your Default Notepad,Or what i prefer is Notepad ++ which i am using currently :p
*If you use Notepad ++,it would be easier so you can download Thijn's plugin which will help you.
(Always remember,.conf aint squirrel SCRIPT file,its a configuration file.)