File error and won't open anymore

During modeling, this sequential error appears and it seems to corrupt the file and no longer open it, and when I try to open it again it gives the same error.

The images indicate the sequence of messages.

I'm worried, because if there is an error in extensive modeling and I can't recover it, it will be difficult.
I would like to know if there is a way to recover this corrupted file?

Below are the files that have this problem.

EST-1.dgn

EST-2.dgn


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