File Explorer Issue

Question

Apparently, I've accidentally clicked on something that has changed what is displayed when I open a file from my File Explorer. The contents of my files are no longer displayed in English (the language in which all my files are written), and although I'm not a programmer, I think that it's the programming code that is now being displayed.
I haven't been able to locate a heading or an option within the File Explorer to 'Undo' an action, and since I don't know what I've done to create this situation, I don't know where to begin to look for a remedy or a procedure to reverse or correct it.
I'm trying not to panic, but it's a frightening problem, because all my files are maintained in my File Explorer, and as far as a can determine, I have no real access to any of them until (and unless) this problem is solved, and I have absolutely no idea as to what I'll do, if this should prove to be unfixable.
I'll very much appreciate any assistance and/or help I may receive, and I'll be most grateful to anyone who can tell me what I must do to undo whatever I've done to create this problem and make it possible for me to read (access, use and work with) my files.
Thank you very much.
Leanne Stack-Martin
<Email Removed for Privacy>

Answer 1

It looks like a problem with Default applications.
Go to:
Setting/App & Features/Default Apps/ go to the end and click reset to the Microsoft recommendeden defaults.

Answer 2

1. Cleanup below Temp folders
   C:\Windows\Temp
   %USERPROFILE%\AppData\Local\Temp
2. Run below DISM command from elevated prompt.

DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth

3. Repair Explorer from system maintenance troubleshooter

On the taskbar, type control panel in the search box. Select Control Panel from the results.

On the View by menu, choose Large icons or Small icons.

Select Troubleshooting > View all > System Maintenance.

On the System Maintenance troubleshooter, select Next > Try troubleshooting as an administrator and review the results.

4. To restore the original settings for a particular folder in File Explorer, use these steps:

Open File Explorer.
Click on the View tab.
Click on the Options button.

Click on the View tab.
Click the Reset Folders button..
Click the Yes button.
Click the OK button.

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