Depending on what's packed in the .rar file you would need things like Daemon Tools if there is an image file .iso .mdf .mds and some others or if it's an executable a good anti-virus just in case. Also things that emulate a location to trick the game into thinking it's running in a different region like Locale Emulator. Last but not least if the game needs a cracked executable to run you'd have to wait to see if one is made available.
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Dranagora
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