Back in the days of DOS, changing file attributes required that you learn about the attrib command and its switches. With the advent of Windows XP, the use of the attrib command at the Command Prompt has drastically dropped. However, if this is only true if you need to do anything other than flip the Read Only, Hidden or Archive attributes on a file.
If you need to change other attributes, like the System File attribute, you’re going to need to bring attrib and its switches out of the closet.
To remove the system attribute from a file, say one named MyFile.ext, do the following. Open a Command Prompt windows and in the directory that MyFile.ext is in, type
attrib -MyFile.ext -s
and press Enter. This will remove the system attribute from the named file.