file explorer not open

Hello Sitaram

First i would prefer you to do a restart.
After that please check up the Windows Updates, if you still have the Problem.
Here also a Documentation Link from Microsoft:
https://support.microsoft.com/en-us/windows/fix-file-explorer-if-it-won-t-open-or-start-ce614e06-be97-fe4a-a7ce-d6bf13a8cb98

But last one i would do is to it with Powershell. Just start it as an Admin and run it:

Get-appxpackage -all *shellexperience* -packagetype bundle |% {add-appxpackage -register -disabledevelopmentmode ($_.installlocation + “\appxmetadata\appxbundlemanifest.xml”)}

I hope you will get your file Explorer back.
Best Regards
Koray