hidden files than can not returns it back

my questions are 2:
1-sometimes i saw a file that is hidden and can not uncheck the hidden of its(see the picture below)

how can we do this with a file?
2- how can we returns this file back to unhidden?

When the option to hide/unhide a file is greyed out, that is usually means that the file has the S (system) attribute set.

If the file is truly a system file, then you should not remove the S attribute.

ATTRIB - Wikipedia, the free encyclopedia

UsernameIssues said:

When the option to hide/unhide a file is greyed out, that is usually means that the file has the S (system) attribute set.

If the file is truly a system file, then you should not remove the S attribute.

ATTRIB - Wikipedia, the free encyclopedia

the file is on a CD.does the CMD work for that?

Probably not.
You can copy the file to your local hard drive, change the attribute(s) and burn a new CD.

thank you very much