Windows Integration Errors

How to Fix Word and Excel Bad Image Error (AppVisvSubsystems64.dll 0xc000012f)

Maira Mehtab Sep 22, 2026 868 views

Question details

Users are unable to open Microsoft Word and Excel due to a Bad Image error citing AppVisvSubsystems64.dll and status code 0xc000012f.

Product: Microsoft Word and Excel
Device & OS: Windows
Scenario: Launching Microsoft Word or Excel applications for daily tasks.
Observed behavior: The applications fail to start and instead display a system popup showing a Bad Image error, referencing the AppVisvSubsystems64.dll file along with error status 0xc000012f.

Before you start

Ensure you have an active internet connection and your Microsoft account credentials ready, as resolving this issue may require downloading Office repair files.

Solution 1Recommended

Repair Microsoft Office via Windows Settings

Use the built-in Windows repair tool to fix corrupted Office installation files causing the DLL error.

Running a Quick Repair can often resolve minor file corruption issues without needing an internet connection. If the Quick Repair fails, the Online Repair option will download fresh files to perform a more thorough fix.

Open Windows Settings

Click on the Start menu and select 'Settings' (the gear icon), then navigate to 'Apps' and select 'Apps & features' (or 'Installed apps' in Windows 11).

Locate Microsoft Office

Scroll through the list or use the search bar to find your Microsoft Office or Microsoft 365 installation. Click on it and select 'Modify'.

Run Quick Repair

In the pop-up window, select 'Quick Repair' and click the 'Repair' button. Wait for the process to complete and try launching Word or Excel.

Run Online Repair (if needed)

If the Quick Repair did not fix the 0xc000012f error, repeat the steps above but choose 'Online Repair' instead. This process will take longer and requires an active internet connection.

Administrator Privileges: You will need Administrator access on your Windows PC to run the Office repair tool.

Solution 2

Uninstall and Reinstall Microsoft 365

Completely remove and reinstall the Office suite to ensure the system architecture matches and all corrupted DLL files are replaced.

Free Microsoft Office alternative

Avoid Complex Installation Errors with WPS Office

If persistent Microsoft Office errors like the AppVisvSubsystems64.dll Bad Image issue are interrupting your workflow, consider switching to WPS Office. It provides a lightweight, highly compatible alternative for Word, Excel, and PowerPoint documents without the heavy system integration that often causes these errors.

1. Download WPS Office: Visit the official WPS website and download the free installer for Windows.
2. Install Quickly: Run the lightweight setup file, which installs in seconds without complex system dependencies.
3. Open Your Documents: Launch WPS Writer or Spreadsheet and seamlessly open your existing Word or Excel files.

Seamlessly opens and edits Microsoft Office formats (.docx, .xlsx, .pptx)Lightweight architecture that reduces the likelihood of Windows system DLL conflictsFamiliar and intuitive user interface requiring no learning curveFree to download and use for all essential office tasks

microsoft office alternative - wps office

Frequently Asked Questions

What causes the 0xc000012f Bad Image error in Microsoft Office?

This error typically occurs when a required executable or DLL file, such as AppVisvSubsystems64.dll, is corrupted, missing, or incompatible with the current Windows installation.

What is the difference between Quick Repair and Online Repair?

Quick Repair runs faster by fixing common file corruption issues using cached files on your computer. Online Repair takes longer and requires an internet connection because it downloads fresh files directly from Microsoft servers to perform a comprehensive fix.

Will I lose my documents if I uninstall and reinstall Microsoft Office?

No, uninstalling Microsoft Office only removes the application files. Your personal documents, spreadsheets, and presentations saved locally or on OneDrive will remain safe and unaffected.

How do I check if my Windows is 32-bit or 64-bit?

Open your Windows Settings, select 'System', and then click 'About'. Look for the 'System type' field, which will explicitly state whether you are running a 32-bit or 64-bit operating system.

Microsoft Office Error Codes