These are not exactly 'necessary' they are just a way of making use of some of the effects found on the FG Library Page. This looks like you actually don't want to 'unzip' it.... you should change the .zip extension to .mod and put it in your 'modules' folder. Then, inside FG, go to the Library and activate it as a module. After that these effects should be available when you click your effects button at the upper right of the screen.
Effects in general can be easily made by using the information on the web page I pointed to above. These effects can be added to spells to be applied to characters during combat. I'm pretty good with these and would be glad to give a tutorial sometime if anyone is interested.

