As I said, if you like, you contact our support and send the file there, and we can have a look at it. Could you tell me more about the circumstances? I notice the file was last updated about 2 weeks ago. It also seems you’ve been using AxCrypt 2 since before then. Please let us know as much as possible about what you can recall, such as what version of AxCrypt you were using, and when you last successfully opened it.
It’s only the first 16 bytes that are there to indicate that it’s an AxCrypt file. That the next 5 bytes are the same is more of a coincidence – you cannot rely on that staying the same in future versions, but you can rely on the first 16 bytes.