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That the file is damaged or corrupted.

I do not know what is your problem with the file, try to download it here https://gamejolt.com/games/Baldi-Nightmare/372851

Sorry, it actually said  "The archive is either in unknown format or damaged." and I've already tried downloading it from gamejolt.

follow my steps! download 7 zip, extract the win rar file with the game on dekstop and right click on the winrar file and you will see 7 zip and click on it and click extract here and a folder will be created on your desktop with the game just click on it and its work! thank's me later