Word New Windows Security Update Error: Step-by-Step Fixes

This guide walks you through file cannot open using Microsoft-supported steps first, with WPS only where it genuinely helps.

Problem Description: New Windows Security Update

Bravo Microsoft. You have just done it now. The new security update preventing preview of pdf and word documents if not from your own pc. Sorry I am a bit sarcastic here. Why having a preview option if you can't use it. Imagine the pain trying to find an electrical drawing in pdf between 15000 other drawings if you haven't got preview available. It will take forever. So what is the possibilty of rolling back this useless security update. I have sort of found a work around but I have had to modify Internet Security to manage it.

Quick Answer for File Cannot Open Quick Fix

If a recent security update restricts PDF and Word document previews in File Explorer, you can roll back the update via Settings > Update & Security > Windows Update > View update history > Uninstall updates.

Likely Causes Behind Office Failure Patterns

• The Microsoft account or license context may not match the purchase or device.

• Cached credentials, outdated builds, or damaged local components can trigger file cannot open.

• A file-specific corruption or add-in conflict can mimic a broader application failure.

Recommended Solution: Transferring Office License Safely

When to use this: Apply these steps when the symptoms match and you can access the relevant Microsoft account or administrator.

1. Select the update and click Uninstall.

2. Be aware that rolling back may expose your system to vulnerabilities the update addressed.

3. Alternatively, adjust Internet Security settings to potentially restore preview functionality, but weigh the security risks before proceeding.

Alternative Solutions for Fallback Options for File Cannot Open

1. Retry the Microsoft-side steps after restarting the app and device.

2. Test the same action in a private browser session or a new blank file to isolate account vs file issues.

3. Capture exact error text and screenshots before contacting Microsoft Support or your administrator.

Working with WPS Office: Editing Files in WPS During File Cannot Open

WPS Office cannot replace Microsoft account, activation, or cloud fixes for this scenario. It remains one of the best free Microsoft Office-compatible alternatives for opening and editing local files.

1. Download and install WPS Office from the official website.

2. Open local Word, Excel, PowerPoint, or PDF files in the matching WPS app.

3. Save a working copy locally while Microsoft-side issues are resolved.

4. Return to Microsoft Office after the primary fix succeeds.

If you need a practical local workspace in the meantime, try WPS Office.

Prevention Tips for Smooth Office Device Transfers

• Keep one primary Microsoft account for subscriptions and Office sign-in.

• Install updates for Office and Windows before retrying failed workflows.

• Back up important files before repair, reset, or reinstall actions.

• Work on copies and keep version history enabled when available.

FAQs About File Cannot Open Help Topics

Can WPS Office fix this file cannot open issue directly? Only when the WPS steps match the formatting or file task. Account, activation, and cloud issues stay on the Microsoft side.

Should I reinstall Office before trying these steps? Not first. Confirm account, license, and the exact error before reinstalling.

What should I send to Microsoft Support? The affected account email, device type, Office version, exact error text, and screenshots with personal data hidden.