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How to Fix Word File Format Does Not Match Extension Error
Question details
The user needs to recover a document that triggers a file format and extension mismatch error.
- Product
- Microsoft Word
- Device & OS
- not provided
- Scenario
- Attempting to open a recovered document, an AutoRecovery (.asd) file, or a damaged file in Word.
- Observed behavior
- Word displays an error stating that the file format does not match the file extension, preventing the document from opening.
Before attempting recovery, ensure you have enabled 'Show file name extensions' in your system settings to accurately verify the document's current extension.
Recover Unsaved Documents via Word's Built-in Feature
Use this method if your file is an AutoRecovery (.asd) file that Word is struggling to open directly from your file explorer.
AutoRecovery files use the .asd extension, which requires a specific opening method within Microsoft Word to bypass the mismatch error.
Launch Microsoft Word on your computer and open a blank document.
Click on the 'File' menu in the top-left corner of the screen, then select 'Info' from the left-hand navigation pane.
Click on the 'Manage Document' icon to reveal a dropdown menu containing recovery options.
Select 'Recover Unsaved Documents'. A file dialog box will appear; locate your problematic .asd file, select it, and click 'Open'.
Convert the Corrupted File using Google Docs
If the file is damaged and Word refuses to open it, uploading it to a cloud processor can bypass local format restrictions and repair the file.
Perform an Online Repair for Microsoft 365
If the error persists across multiple files or standard documents, your Microsoft 365 installation might be corrupted and requires a repair.
Try WPS Office to Open Problematic Word Documents
If Microsoft Word continues to struggle with file format mismatch errors, WPS Office offers a free, lightweight, and highly compatible alternative. Its robust document processing engine can often successfully open damaged or mismatched files that standard processors reject.
- 1. Download WPS Office: Visit the official WPS Office website and download the free installation package.
- 2. Install the Software: Run the downloaded installer and follow the quick setup instructions.
- 3. Open Your Document: Right-click your problematic document, choose 'Open with', and select WPS Writer to access your content.
Frequently Asked Questions
What does 'file format does not match extension' mean in Word?
This error means the actual internal structure of the document (such as a temporary AutoRecovery file or an older binary .doc format) contradicts the file extension (like .docx) assigned to its file name. Word blocks the file from opening for security reasons.
Can simply renaming the file extension fix the mismatch error?
Sometimes. If a .docx file was accidentally renamed to .doc (or vice versa), manually changing the extension back to its original state can resolve the issue. However, if the file is genuinely corrupted or is an .asd file, renaming it won't fix the underlying structure.
Where are Word AutoRecovery (.asd) files typically stored?
By default on Windows, Microsoft Word AutoRecovery files are saved in the hidden AppData folder, typically located at C:\Users\[YourUsername]\AppData\Roaming\Microsoft\Word\.
Is it safe to run an Online Repair for Microsoft 365?
Yes, Online Repair is a built-in Windows utility that safely reinstalls missing or corrupted Office components. It will not delete or alter any of your personal documents or files.
