Forum Discussion
Excel cannot be open the file 'filename.xlsx' because the file format or file extension is not valid
Muthu69 This same thing just happened to me and, using trial and error, finally found a solution and got my Excel file to work again! Log in to your OneDrive, find the file, right click, click version history, and on the left panel, click on prior versions until you find one that works and click restore. Hope this is helpful! Take care.
It happened to me too, and found out that the version history way also works in file explorer.
This is how I did it:
open file explorer > find the file (with which you have the problem) > right click > click "version history" > click on "more options" (three dots on the right when hovering over the versions) of the second or lower option > click on "Download" > go to "downloads" in the file explorer and open the version that you downloaded
Yoshi1175 That's amazing! Super simple and effective! No one needs to worry or have heart attacks or anything at all anymore! Thank you!