Office Settings & Configuration

Fix Microsoft 365 Opening Word but Not Excel or PowerPoint Files

Maira Mehtab Sep 28, 2026 871 views

Question details

After installing Microsoft 365, Word documents open normally, but Excel and PowerPoint files fail to open automatically and prompt Windows to choose an application.

Product: Microsoft 365
Device & OS: Windows
Scenario: Attempting to open existing .xlsx and .pptx files directly from File Explorer after a Microsoft 365 installation.
Observed behavior: Windows does not recognize the default application for Excel and PowerPoint files, prompting the user to manually select a program from a list.

Before you start

Before modifying your system settings, verify that your Microsoft 365 subscription is fully activated and that the installation process for the entire suite has completely finished.

Solution 1Recommended

Run an Office Quick Repair

Using the built-in Microsoft Office repair tool is the most effective way to automatically restore broken file associations for the entire suite.

A Quick Repair scans your Office installation and replaces missing or corrupted registry keys that handle file associations without requiring an internet connection.

Open Windows Settings

Press the Windows key + I to open Settings, then navigate to Apps > Installed apps (or Apps & features).

Locate Microsoft 365

Scroll through the list of installed programs or use the search bar to find your Microsoft 365 installation.

Select Modify

Click the three dots next to Microsoft 365 (or right-click it) and select Modify from the context menu.

Execute Quick Repair

Choose 'Quick Repair' from the dialog box, click 'Repair', and follow the on-screen prompts until the process finishes. Restart your computer.

Data Safety: Running a Quick Repair will not delete any of your personal documents, spreadsheets, or presentations.

Solution 2

Set Default Program via the 'Open with' Menu

You can manually force Windows to always use Excel or PowerPoint for specific files directly from File Explorer.

Solution 3

Assign Defaults in Windows Settings

Use the Windows Default Apps menu to explicitly define which application handles specific file extensions.

Free Microsoft Office alternative

Avoid File Association Errors with WPS Office

If you frequently encounter missing registry keys, broken file associations, or heavy updates with Microsoft 365, consider switching to WPS Office. It delivers a seamless, all-in-one workspace that opens Word, Excel, and PowerPoint files flawlessly without the heavy system footprint.

1. Download and Install: Visit the official WPS Office website to download and install the software.
2. Set as Default: During installation, allow WPS Office to be set as your default program for Office files.
3. Open Your Files Seamlessly: Double-click any Excel or PowerPoint file to open it instantly in the WPS all-in-one interface.

Free to use with a lightweight, rapid installationFully compatible with Microsoft Office formats including .docx, .xlsx, and .pptxAll-in-one tabbed interface manages documents, spreadsheets, and presentations in a single windowNo complex individual file association setups required

microsoft office alternative - wps office

Frequently Asked Questions

Why does Microsoft 365 open Word but not Excel?

This typically occurs when the specific Windows registry keys that associate .xlsx and .pptx file extensions with their respective applications become unassigned or corrupted, even if the software is correctly installed.

Will an Office Quick Repair delete my personal files?

No. Running an Office Quick Repair only scans the program's installation files and registry entries to fix issues. It will not touch, modify, or delete any of your personal documents.

What should I do if Quick Repair doesn't fix the issue?

If Quick Repair is unsuccessful, you can attempt an 'Online Repair' from the same Windows Settings menu, which downloads and reinstalls a fresh copy of Microsoft 365. Alternatively, manually set the file associations using the 'Open with' method.

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