The gold standard for verifying a file's authenticity and integrity is a cryptographic hash, typically an SHA-256 string. Think of this as a digital fingerprint that is unique to that specific file. If the file is altered by even one single byte (e.g., if someone injects a virus into it), the entire fingerprint changes.
Convert a save file from an North American (NTSC-U) format to a European (PAL) format. ps2 memory card save editor verified
General hex editing is hard. Instead, use a verified game-specific tool. For Final Fantasy X , the community recommends "Farplane" (by ffgriever). The gold standard for verifying a file's authenticity