A standard, unencrypted global-metadata.dat file always starts with the "Magic" hex signature: AF 1B B1 FA . The file is not encrypted.
: Decryption is rarely a "one-click" process. It often requires matching the global-metadata.dat with the game's executable ( libil2cpp.so or .exe ). decrypt globalmetadatadat
IL2CPP Tutorial: Finding loaders for obfuscated global-metadata.dat files Decrypting GlobalMetadata