Method 3: Opening the file with a 3rd party equivalent If the same ‘File Format and Extension of Don’t Match’ error is still appearing, move down to the next potential fix below. As soon as the file has been unblocked, launch the file again (no restart required) and see if the issue is now resolved.Once you’re inside the Properties menu, select the General tab from the horizontal menu at the top, then scroll down to the Security section and simply click the Unblock button.Then, click on Properties from the newly appeared context menu.
Navigate to the location where the Excel file is stored and right-click on it. Here’s a quick guide on unblocking excel files that are triggering ‘File Format and Extension of Don’t Match’ errors at launch: If this scenario is applicable, you can resolve the issue very easily by accessing the Properties screen of the file that is triggering the error message and unblocking it via the Security tab. This is a typical occurrence with files downloaded over the internet or received via email attachments as a security option. Method 2: Unblocking the file (if applicable)Īs it turns out, the ‘File Format and Extension of Don’t Match’ error can also occur because it’s being blocked at a Properties level. In case none of the formats above work or you’re looking for a different fix for the issue, move down to the next method below. Modifying the Excel file to the correct format Eventually, you should stumble upon the correct format that will open the file without triggering the same error message. 
xlsm, and attempt to open the Exel file after each modification.
Then, modify the extension (after ‘.’) systematically to. When you get there, right-click on it and choose Rename from the context menu. Once file Name extensions have been enabled, navigate to the location where you store the excel file that is showing this error. From the newly appeared vertical menu, ensure that the box associated with File Name Extensions is checked. First things first, open File Explorer and click on the View tab at the top of the screen. Several affected users that were also encountering this issue have reported that they managed to fix the problem by manually changing the extension (via renaming) to various popular Excel formats until they found the correct one. If you see the ‘File Format and Extension of Don’t Match’ error, the Excel file you are trying unsuccessfully to open is likely in fact of a different extension that the one that is currently hardwired. In most cases, the error message is pointing to the right cause. Method 1: Changing the extension manually Add test files to rails app chef update#
The message is not suppressed – If you mind the message but you don’t want to update your Office build to a newer version in which this issue was resolved, one viable way of ensuring that the error doesn’t return is to suppress the warning message by using the Registry Editor to create an ExtensionHardening value.In this case, you can resolve the issue by accessing your Excel settings and disabling Protected Views from the Trust Center Menu. Protected Views is Enabled – There’s also a new security option that might end up preventing the main excel application from opening certain files that we obtained through an email attachment.
To fix this problem, you can rely on another 3rd party tool equivalent like OpenOffice Calc (belonging to the OpenOffice suite).
The file is incompatible with Excel – As it turns out, this issue can also occur due to an incompatibility between the file you’re encountering the issue on and Excel. In this case, you can resolve the issue automatically by unblocking the file via the Properties menu. Nowadays, a lot of email providers will block it automatically for security purposes. Excel file is blocked – If you obtained the Excel file after downloading it from an email attachment, there’s a high chance that the file is blocked at a Properties level. If this scenario is applicable, you can fix the issue by changing the extension manually to the correct one. This can happen automatically after the file is converted or manually after a user intervention. Incorrect extension – It the majority of cases, this particular issue will occur because the Excel file you’re trying to open is in fact of a different extension than the one that’s currently hardwired.
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