How do I fix file format does not match the file extension?

Here's a photo of the document properties Tried to change the file type to no avail, also tried converting it to a phd ("File not found", and also uploading it to word online/google docs to try open it.

Table of Contents Show

What can I do if Excel file format and extension don’t match?
1. Change the file’s extension
2. Select the Open and Repair option
3. Unblock the Excel file
4. Turn off Protected View
5. Open the file in LibreOffice Calc
How do I fix the file format and extension of don't match?
How do I match a file extension with a file format?
What does file format and extension don't match mean?
How do I change the file extension wrong?

Downloaded a 2010 file format converter by Microsoft as a random attempt to fix it too - but as you can see the document is already docx

Laptop is low on space, could this be a factor? I would have thought not if it isn't even uploading elsewhere.

Thanks for any help in advance!

Edit Solution:

File Explorer go to View then Options then View and clear the "Hide Extensions by known File Types" (this is what I had missed before)

This may solve the issue and work as normal - else, you may get a message saying the "files with a.asd extension can not be opened from this location" = part B

Copy the document from the File Explorer

Go to C:\Users%username%\AppData\Local\Microsoft\Office\UnsavedFiles by pasting this in the start menu

Paste the document here, and change the file type to .asd

Open word, click Open and at the bottom of the page select "Recover Unsaved Documents"

Save document after opening

by Matthew Adams

Matthew is a freelancer who has produced a variety of articles on various topics related to technology. His main focus is the Windows OS and all the things... read more

Published on May 23, 2020

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On the Microsoft support forum, some Excel users have discussed an error message that states: The file format and extension of ‘file.xls’ don’t match. The file could be corrupted or unsafe. Unless you trust its source, don’t open it. Do you want to open it anyway?

Users can then select to open the Excel file. However, users have said that their spreadsheet files have lost all their data when they click Yes to open. If you need to fix that same error, check out some of the resolutions for it below.

What can I do if Excel file format and extension don’t match?

1. Change the file’s extension

Some users have fixed the issue by manually changing the file’s extension to various standard Excel file formats until they get the right one. Click the File Explorer button on Windows 10’s taskbar.
Select the File name extensions option on the View tab.
Open the folder that includes the Excel file the error arises for.
Right-click the file and select the Rename option.
Then edit the extension at the end of the file to. xls, .xlsx, or .xlsm. Try opening the Excel spreadsheet with each of those alternative file formats.

2. Select the Open and Repair option

The Excel file might be corrupted, and you can fix it with the Open and Repair option. First, open Excel’s window.
Select the File tab.
Click Open to the open the window shown directly below.
Select the file the issue arises for.
Then click the arrow on the Open button. Select the Open and Repair option.
Select the Repair option.
If the Repair option doesn’t fix the issue, repeat the above steps and click the Extract Data button. Then you can click Convert to Values to extract data from the sheet.

3. Unblock the Excel file

Some users have confirmed they’ve fixed the file format does not match extension error by unblocking the file. To do so, open File Explorer.
Open the folder path that includes the Excel spreadsheet file which needs fixing.
Right-click the Excel file to select the Properties option.
Select the General tab on that window.
Click the Unblock option. Note that option will only be visible for files that came from another source, such as email attachments.
Press the Apply button.
Click exit to close the window.

4. Turn off Protected View

Turning Excel’s Protected View off might also resolve the file format does not match error. Click Excel’s File tab.
Click Options to open a window like the one shown directly below.
Click the Trust Center tab on the left of the window.
Press the Trust Center Settings button.
Then click Protected View on the Trust Center window.
Deselect all three Enable Protected View settings there.
Click the OK option on the Trust Center window.
Then click OK again to exit the other window.

5. Open the file in LibreOffice Calc

You can also try opening the Excel file the error arises for in LibreOffice Calc. That’s a freeware spreadsheet application you can add to Windows by clicking Download on the Download LibreOffice page. Then install Calc’s office suite with the downloaded setup wizard.

When you try opening the file in LibreOffice Calc, the application might ask you to select an appropriate format. Select alternative formats until you get the file opened. Thereafter, you can copy and paste all the data in the spreadsheet into a blank Excel sheet with the Ctrl + C and Ctrl + V keyboard shortcuts.

Those are some of the confirmed resolutions that users have fixed Excel’s file format does not match extension error with.

If the file the issue arises for is not from a trusted source, however, do not select to open it. Instead, scan the file with antivirus utility before trying to open it.

How do I fix the file format and extension of don't match?

Re: In Excel: "The file format and Extension don't match”..

In Excel 2010 and newer versions, click on the File menu..

Then, in the Info screen that appears, click on Options..

In the 'Excel Options' window, under the Save workbooks section, click on the Save files in this file format: drop-down. ... .

Click OK..

How do I match a file extension with a file format?

How To Fix File Format And Extension Don't Match Error In Excel?.

After enabling the file name extension, go to the location where you have saved your error showing Excel file..

Make a right click over that file and select the rename option..

Change the extension to any of these formats: . xls or . xlsx or ..

What does file format and extension don't match mean?

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.