How to read and edit a file?

Question

Visual Basic

There is a game file . It encoded the lines responsible for the characteristics of the character. How can one read and edit a file programmatically? What algorithm?
I would like to write a small editing program.

Answer 1

This is a non-standard format, the algorithm can be anything.
Read with any HEX editor, try it.

Answer 2

You can read and edit with a HEX editor. To write an editing program, you need to know or understand how the format works.