You ask what is my problem? So - there was a nuisance with a massive file .ai format. Mostly I work in Illustrator, but a temporary move from my main place of work made me use Gimp. Almost before the delivery of the layout to the customer, apparently, the wrong alignment of the layers of filters occurred, and now when you open it you can see something with an extended scale, you can’t edit - because errors appear. What else can you try to open? I really hope that you will not have to redo the whole work again.