Hi mmjjkk, I am Paulo, an Independent Advisor, and I'm willing to help.
I believe that the one with the generic icon was from an older version of Windows and it wasn't a virus. I also have one in C:\Windows with the generic icon same with this thread
https://answers.microsoft.com/en-us/windows/for...
You can verify what your Windows is currently using by searching Notepad in Start menu > Open location > Right-click then Properties. See if the path is C:\Windows\System32.
It is just weird that Microsoft didn't remove it after updates. If you notice in the thread that the versions were different. But If you run the one with the generic icon, the version will change with the current one just like I did.
I hope this somehow helps.