This post fromMiniToolprovides some solutions for you.

This issue can be found on Windows 10/8/7.

The detailed information is as follows.

the error message

What causes the Microsoft Word isnt your default program issue?

Here are the feasible fixes.

Step 2: ClickOptions>General.

Fixes: Word Experienced an Error Trying to Open the File

Scroll down to find and click theStartup options.

Step 3: Uncheck theTell me if Microsoft Word isnt the default program for viewing and editing documentsoption.

Thus, you’re able to check the default apps.

choose Manage

Step 1: Press theWindows + Ikeys together to openSettings.

Step 2: Go toApps > Default apps> Set defaults by app.

Step 3: In the list, find your Word app and click it to chooseManage.

choose Notepad as the default

Step 4: Then youll see a list of file types Word can open.

Select Word for all file types its not the default app.

Step 1: TypeControl Panelin theSearchbox to open it.

Guide - How to Turn off Dark Mode on Word (Windows and Mac)

Step 2: Then, clickPrograms and Features.

Step 3: Find and choose Microsoft Office.

Then, click theChangeicon.

Step 4: Select theQuick RepairorOnline Repairbutton.

Step 1: Right-hit the file that you want to open and chooseOpen with….

Step 2: SelectChoose another app>More apps>Notepad.

Step 3: Check theAlways use this appbox and click theOKbutton.

Step 4: Then right-snag the same file again to selectOpen with>Choose another app>Word.

Step 5: Select theAlways use this appoption again, and click theOKbutton.

How to turn off dark mode on Word for Windows and Mac?

This post provides a step-by-step guide for you.

Continue to read this post.

it’s possible for you to try them one by one.