File Cannot Open

Fix Word File Cannot Open After Renaming in Windows

Maira Mehtab Sep 21, 2026 869 views

Question details

The user is unable to open a document after renaming it. This issue typically occurs when the file extension is accidentally removed or changed during the renaming process, or when the new file path exceeds the operating system's character limit.

Product: Windows / Microsoft Word
Device & OS: Windows
Scenario: Renaming a file or document via Windows File Explorer or a mobile device, after which the application fails to recognize or open the file.
Observed behavior: The file icon may turn into a blank sheet, and attempting to open the file displays an error message stating the file cannot be opened, or the application simply fails to launch it.

Before you start

Before troubleshooting, open Windows File Explorer, click the 'View' tab, and check the 'File name extensions' box so you can clearly see if your document has the correct format ending (like .docx).

Solution 1Recommended

Restore the Missing File Extension

Use this method if your file lost its association with Word and looks like a blank, unrecognized file after renaming.

When renaming a file in Windows, it is easy to accidentally delete the extension (the letters after the dot at the end of the filename). Without this extension, Windows does not know which application to use to open the file.

Enable file extensions

Open File Explorer in Windows. Navigate to the 'View' tab at the top and ensure the checkbox for 'File name extensions' is checked.

Rename the file

Right-click the problematic file and select 'Rename'.

Add the correct extension

Type the original extension at the end of the filename (for example, add '.docx' for a Word document) and press Enter.

Confirm the change

Windows will display a prompt warning you about changing the file extension. Click 'Yes' to confirm and try opening the file again.

Format Restored: The file icon should revert to the standard Word document icon, indicating it can now be opened normally.

Solution 2

Shorten the File Name or Folder Path

Use this solution if the file extension is correct but you still receive an error, which may indicate you have exceeded the Windows path-length limit.

Manage and Recover Renamed Documents Safely with WPS Office

WPS Office provides a smart, built-in file management system that prevents accidental extension deletion when managing documents. If you have a file with a missing extension, WPS Office can often automatically detect the underlying format and open it directly.

1. Launch WPS Office: Open the WPS Office application on your computer and navigate to the Home screen.
2. Browse for your file: Click on 'Open' from the left sidebar and navigate to the folder containing your problematic renamed file.
3. Change the file filter: Click the file type dropdown menu next to the file name box and select 'All Files (*.*)' to ensure your extension-less file is visible.
4. Open the document: Select the file and click 'Open'. WPS Office will intelligently attempt to read the document data regardless of its missing extension.
5. Save with correct extension: Once the file is open, go to 'Menu' > 'Save As' and select the standard '.docx' format from the dropdown to permanently fix the file.

Highly compatible with Microsoft Office formats including .docx, .xlsx, and .pptxIntelligent file recognition opens files even if extensions are missingBuilt-in 'Save As' tools easily correct document format issuesLightweight, fast, and free for fundamental office tasks

microsoft office alternative - wps office

Frequently Asked Questions

Why did my Word file icon turn into a blank white sheet after renaming it?

This happens when the file extension (such as .docx) is accidentally deleted during the renaming process. Without the extension, Windows loses the association with Microsoft Word and does not know which app to use to display or open the file.

What is the maximum file path length limit in Windows?

By default, Windows limits file paths to 255 characters. This count includes the drive letter (e.g., C:\), every folder name in the hierarchy, and the actual file name. Moving the file to the Desktop often resolves issues related to this limit.

Can I recover a document if renaming it back to .docx doesn't work?

Yes. Open your word processing application first (like Word or WPS Writer), then go to File > Open and browse for the document. Applications can sometimes bypass File Explorer errors and open the file directly from within the program.

How do I show file extensions on a Mac?

On a Mac, open Finder, click 'Finder' in the top menu bar, and select 'Settings' (or 'Preferences'). Click on the 'Advanced' tab and check the box for 'Show all filename extensions'.

Document & File Issues