I'm trying to modify the music in an old Flash game called 'Miragine War'. The problem is that its assets are stored in a binary file that seems to be encrypted, containing sprites, music, and various resources. I've attempted to decrypt it using tools like JPEXS Decompiler, but I haven't had any success. Is there a way to decrypt this file, or could it be in a different format?
3 Answers
In many cases with Flash games, files like this aren't actually encrypted but rather stored in a custom format that could involve compression or obfuscation. If JPEXS isn’t working, it might not recognize the file due to non-standard tags. The best next step is to analyze the file format, checking for magic bytes and patterns. If you can share a hex snippet and the loading method (AS2 or AS3), someone might help you identify the format. Just make sure there aren't any copyright issues before attempting any extraction.
Are you planning to link the file? It’s possible that it might be in a different format instead of being truly encrypted. It seems unusual for a game to encrypt assets that need to be accessed by the client. Also, here's the bin file [BIN](https://github.com/kankenyt/flashgame/blob/main/3_DFe_DF.bin) and the swf file [SWF](https://github.com/kankenyt/flashgame/blob/main/Miragine_War.swf) for reference.
First off, how did you figure out it’s encrypted? And just curious, why go for a decompiler when there might not be encryption involved? Usually, extracting info from typical files is simple, but in this case, it’s a whole different ballgame. It's worth experimenting with for your own learning!

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