Trouble opening file

I created this file earlier today then shutdown SU. When i went to reopen it later i noticed it somehow saved as this goofy file type can someone help me figure out how to open it? Already tried clicking open with SU 2017 but it opens and says this is not a SU model. It won’t even let me upload it here. It is saved as a 17 File not sure what that means.


if you zip the file you can upload that…