actually i encrypt my files due to some pc problem i have got window after window my file is not open i want to know that how i can open my file Excel cannot open the file 'filename.xlsx' because the file format for the file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file this type of message shown after the file open you have any solution regarding this
Solved by A. A. in 15 mins