Key Symbol in Icon for Header Files

Hi,

We use CCS V5.4.
If I exclude a header file from build (check box "Exclude resource from build" in Properties dialog for that file) it gets greyed out. So far so good.
But if I don't want to exclude anymore there appears a key symbol in the icon (icon overlay). Is there any way to remove the key symbol?
If I do the same with a c-File I can right click and choose "Resource Configurations/Reset to defaults..." and the key symbol dissappears.

Any idea?

Thanks.

Best regards,
Patrick