I cant open my project URL/Path something...

I am now working on my game. I clicked on save button. close up gdevelop. turn off pc. Next day i went work on my game (sry for my english) and i cannot open my game!
I got that message:
Unable to open this project. Check that the path/URL is correct, that you selected a file that is a game file created
with Gdevelop and that is was not removed

My file is Gdevelop file. Icon is black paper with black ball on left.
I am thankful before you answer. Sry for my English

Not sure about the icon, it is also depends on what software set to use that file and the icon theme of your OS.
Cold you upload and share the project file so we can have a look? Don’t need the images and staff, only the project file.