Error : Not a diagram file (error on line 1 at column 1: Start tag expected, '<' not found)

[Mina Ismu Rahayu]

I have an issue with my draw.io file suddenly becoming unable to be opened, with an error notification stating 'Not a diagram file (error on line 1 at column 1: Start tag expected, '<' not found)'. Is there a way to recover this file as it is very important? I am using Ubuntu and Chrome. Thank you.

[draw.io Q&A]

This isn't a draw.io file, it's some kind of binary file type.