As The Question said, The location of directory where the screenshots are stored resides in the HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
.
Perhaps The folloing steps can also find the location.
- Go to C:\Users\your_name\Pictures\Screenshots, where “your_name” is the name of your user account.
- Right-click on Screenshots to open a contextual menu and choose Properties.
- Access the Location tab which shows the location.