Hi @GUIDO ROSSI ,
Glad to hear this issue has been resolved!
Thanks for the sharing.
However, due to a recent update in forum policy, the question author now is not able to accept their own answers.
So I have written a brief summary of the solution this issue. Please feel free to accept it as the answer, which would benefit others who also has similar issues in forum.
Issue:
Since I've started using the "new outlook" application I'm experiencing this weird issue: when I want to open an attachment in the desktop application I receive the error "Something went wrong when opening your file. Please try again later."
Solution:
The below action may be useful:
1.OP have changed my password.
2.Just received a "new" outlook update.