Windows 10: I damaged the file cmd.exe, and then months later it fixes itself?

Months ago I was following a youtube tutorial on experimenting with commands. One of them was renaming the cmd.exe, directly from the command prompt.After renaming cmd.exe with the command, I closed command prompt, and minutes later when I wanted to re-open/use command prompt, nothing.I damaged cmd.exe, I made the file corrupt. The cmd.exe file was still there in the original location of the folder System32, but it wasn't working.So in this case, is my fault.Months pass and when I get curious to see if the command prompt would open, it did!?The only answer I have so far for myself is that, per

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Can't open .exe files anymore and can't open cmd or regedit

Hi,

I would highly suggest you to follow the steps mentioned in this article step by step:

CMD not working. Please reply if the issue still persists after this .

 

Windows and CMD- renaming a file in CMD

Steps I've done

Here what happens

• 
  turn on PC
  
• 
  start windows
  
• 
  get blue screen ( message NTFS file)
  
• 
  it reboots returns to diagnosing PC
  
• 
  Diagnose and repair fails
  
• 
  I move to advance options
  
• 
  will not reset windows , I click on CMD
  

things I've tried
commands:

reagentc /disable

reagentc /enable

*************************FAILED
not recognized
**********************************

Please advise

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Unable to open regedit, cmd or any .exe files

Hi, I am encountering a problem that the default app of .exe files has been changed.

While I did some research that many of the solutions suggest that I can reset it via cmd or regedit. However, my oc doesn't let me open any of those.

Everytime I choose to open regedit or cmd. Both of them has the "open with" box popped up, which is the same as other applications.

What is happening to my pc? Can anyone help?

Thanks a lot.