ROM Hack Question about reverse engineer file format

[Arubaro]

Until now I've seen some file formats very similar (I don't remember the exact extension, they were files from Lord of Magna and Crimson Shroud), something like a magic word, a couple of integers about the size of the file, parts of the file, etc... a pointer table and then the data.

I've been able to know some of these facts just by making simple operations, guessing and by luck, but I assume this is not the proper method, so I was wondering what kind of tests and things do you guys do to get this kind of info about an unknown file format.

Thanks in advance.

 

[Shadow#1]

Until now I've seen some file formats very similar (I don't remember the exact extension, they were files from Lord of Magna and Crimson Shroud), something like a magic word, a couple of integers about the size of the file, parts of the file, etc... a pointer table and then the data.

I've been able to know some of these facts just by making simple operations, guessing and by luck, but I assume this is not the proper method, so I was wondering what kind of tests and things do you guys do to get this kind of info about an unknown file format.

Thanks in advance.

What's your end goal?

 

[Arubaro]

It's curiosity.
Just want to know what kind of steps people do to get info about a file format, nothing serious

 

[Shadow#1]

It's curiosity.
Just want to know what kind of steps people do to get info about a file format, nothing serious

Then reason u to continue