I made an huge world in creative with an flat world, i had it for 3 months and just the moment i wanted to enter my world minecraft just crashed. I decided to look at the save data where the worlds contain and i saw something called Corrupted Data which made me think the world is corrupted, it just shows up normal on the menu and when i try to enter it is just like minecraft is frozen, it does not work and the controls are frozen

The background animation in the nether just stops but the music is stil on.

When i tried to go to edit the world and make an copy of it it also had the same reaction. I waited quite a few minutes and nothing happend. Just frozen minecraft...

You will might say oh wow you have an copy of it! But it is an very old copy stored on it...