Before I get into this I would like to preface by saying this is not a save editing question I am working on a system for my game and it needs a bit of save data manipulation,
When I open a .rpgsave file it is filled with letters that mean nothing to me, when I copy the contents of that file and then delete it, I start my game and my game creates a new a file with those exact contents the save file becomes corrupted, and I get an error that looks something like this

Why is this happening?
When I open a .rpgsave file it is filled with letters that mean nothing to me, when I copy the contents of that file and then delete it, I start my game and my game creates a new a file with those exact contents the save file becomes corrupted, and I get an error that looks something like this

Why is this happening?