Can't open .mlx file R2019b

Hi everyone, I'm new to Matlab and I'm using the academic version R2019b. Suddenly MATLAB no longer opens my .mlx file. showing me the error "can't open file". Before this I saved the file with the save function. It is possible that I changed the file extension?Please someone help me. Thanks in advance

[madhan ravi]

Could you share a screenshot?

[Marco Cadile]

Yes of course. If you want i can share my file with you. thanks

[madhan ravi]

Attach your file.

[Marco Cadile]

ok

[Marco Cadile]

Hi Madhan, do you have same news about my file? Thanks

[madhan ravi]

I can’t see you file Marco. I think you forgot to attach.

[Marco Cadile]

Can you give me your mail? So that i will send the file. thanks

[Marco Cadile]

I would prefer attach it in private