Step 1: Open Microsoft Excel > File > Options. Step 3: After OpenOffice Calc was installed, right-click on the file that you’re having issues with and choose Open with > OpenOffice Calc. Step 2: Double-click the installation executable and follow the on-screen prompts to complete the installation. Step 1: Download the Full installation of OpenOffice. Solution 3: Open via 3rd Party Equivalent Software Step 2: Select the General tab then scroll down to the Security section and click the Unblock button. Step 1: Right-click the file and choose Properties from the context menu. Solution 2: Unblock at File Properties level xlsm, and attempt to open the Exel file after each rename. Step 2: Right-click on the file and choose Rename from the context menu. Step 1: Open File Explorer > View tab > Check File name extensions option. Solution 6: Suppressing Warning Message using Registry Key Solution 1: Change File Extension Manually Solution 1: Change File Extension Manually How to Fix “The file format and extension of” Microsoft Office Document Don’t Match All previously saved data will be gone if click on the Yes button. “The file format and extension of” document “don’t match” error prompt when the user trying to open certain files in Microsoft Office especially Microsoft Excel.
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