Rhino Save Won't Open

I Worked an entire day in rhino and saved at the end of the day with no issues, it gave me the “file saved successfully” message, so I closed Rhino. Now I cant open the file, Rhino just tells me it is a read only file and then opens a fresh project. I have made sure that I dont have ‘Read-only’ checked in file explorer, and the file appears normal, showing the correct time stamp from when I saved and it is a 60,000 KB file.

It should still open the file even if it’s read-only though - if you answer yes to the question “Do you want to open the file as read-only” does the file actually open?

maybe the RHL file is still in the folder with the main file?