To access the contents of a .rar file, you will need a utility like 7-Zip or WinRAR.
8-Bit Adventures 2 is a turn-based JRPG inspired by classics like Final Fantasy X , Chrono Trigger , and Mother 3 . It features a lovable cast of seven playable characters and a story focused on saving the world from a vengeful "Glitch". Version 1.01 & Key Updates
It looks like you're referring to a compressed archive for (version 1.01), specifically the GOG (Good Old Games) DRM-free release.