iz-biz

i have a chromebook and an ender three, and i need cura to slice my files, but i can't find how to open it. it shows up in my downloads. but i can't open it, please help.

i have a chromebook, an ender 3 printer and a bunch of zip files from thingiverse i'd like to print, but ender 3's only take gcode files, i would like to make the zip files into gcodes, can you guys help me?