Forum Discussion
Excel cannot be open the file 'filename.xlsx' because the file format or file extension is not valid
Hi All, I have a excel.xlsx file saved in my system which has been corrupted .I atleast need to recover the data stores .It is a file of 124 KB and has around 35 worksheets in the workbook .I hav...
Muthu69 I had the same issue - I had numerous excel files giving me the same error message. I initially though it was due to upgrading to windows 11, and tried to find a fix. Eventually I figured it was related to one drive. I deleted one drive from my machine and reinstalled it. Entered my account details and allowed it to sync. Problem solved. All my excel, notepad and word files can now open without any issues.
