To access the "complete piece" (the game files), you must use an extraction utility since Windows and macOS do not natively support the .rar format as they do with .zip .
: Right-click the Backpack-Hero.rar file and select "Extract to Backpack-Hero/" or "Extract here" . Backpack-Hero.rar
: Use a free tool like 7-Zip or WinRAR . To access the "complete piece" (the game files),
If you are looking for the full, working version of the game contained within a file named Backpack-Hero.rar , you generally need to extract the contents to play. How to Open a .rar File Backpack-Hero.rar