[TUTORIAL] Making BMS Scripts; Post and get help with your BMS scripts!

[eureka]

                                           could you help me   

                                    たつけて ください

Afraid I can't help you with the actual script, but I can tell you that is a lz10 compressed CGFX file.  See  the 10 byte at 000000A8?  (In other words, 5 bytes before the CGFX header), That's a compression identifier, and assuming that's the only CGFX file in the archive, you could select everything after that byte, save it as a different file, and then decompress it.
Maybe struggle could actually help you with an easier method, I'm just telling you how I'd do it with this.