Forum Discussion
"Excel cannot open the file 'filename.xlsx' because the file format or extension is not valid."
Hi I have a file that is saved on One Drive. I had a power cut yesterday evening and when I turned on my PC today, the file will not open. I get the following message: "Excel cannot o...
My issue resolution was because my OneDrive attributes were set to Read-only on some files. Clearing this checkbox fixed this error message.
OneDrive folder > right click > Properties > General > clear Read-only checkbox
OneDrive folder > right click > Properties > General > clear Read-only checkbox