Some editors lets you save files as Read Only so it cannot be modified, if a file was set read only using notepad++, the can be made editable by opening the file and going under Edit ->Set Read-Only (Uncheck). If a file in the file-system is marked as read-only, it can be made editable by clearing the read-only flag,This can be done by by selecting Edit -> Clear Read Only Flag.
If you want to save a file as Read-Only then go to Menu -> Edit -> Set Read-Only (Check) and save the file.
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