Why can't I select the 'Customize this folder' option for folders such as the winnt and winnt\system32 folders?

A. For most folders, you can select the Customize this folder option from the View menu. However, you don’t have this option for the system folders.

The system folders already have hidden desktop.ini files, but you can replace them with another desktop.ini file as follows:

After you complete the above steps, you don’t need to click Show files every timeyou access the folder.