After having saved my .nb file, I tried re-opening it the following day and it now opens as a .txt file, EVEN THOUGH the file name ends in .nb.
I have tried resaving the file as a .nb file, and a few other things but I can’t recover my work.
Any ideas on how to fix this? ( I Have attached the file).
Wooters_Wigner_Function_V1.nb (20.9 KB)