Open a Photoshop file that isn’t compatible with it’s current version?

I need urgent help, please! I can’t open my Photoshop file, due to a compatibility issues. Every time I try to open it, an error prompt would show up “Could not open “filename.psd” because the file is not compatible with this version of Photoshop.”
I just recently created the file and saved it, the way I normally do, I made no changes to my software or operating system and had been using the same version ever since. Does anyone have a clue on how to solve this? I need to access the file. Thank you
