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The file format and extension mismatch error occurs when the user tries to open certain files in Excel. Even if the user clicks Yes to open it, all information previously saved in this file will be deleted. Change the file extension manually Step 1. Open File Explorer> View tab> turn on File Name Extensions. Step 2: Right-click the file and select Rename from the context menu. Step 3: Change the extension to .xls, .xlsx or .xlsm and try to open the exel file after each name change. Unblock at file ownership level Step 1. Right-click… Read Article →

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