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 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.

✌️ Hint: If the file is of type Read-Only then you will see that the Save icon for the file will be gray in color (instead of red → unsaved or blue → saved)
- Notepad++ hex editor Examples
- Are Windows Notepad files recoverable?
- How to add or remove bookmark on a line in Notepad++
- How to rename a tab in Notepad++
- Go to Line Number option in Windows Notepad
- How to Apply Themes to Notepad++
- Notepad++ Save Failed - Please check if this file is opened in another program.
- Encode/Decode URL Query String in Notepad++
- Remove duplicate lines using Notepad++
- Add comma or semicolon at end of each line Notepad++
- How to open Notepad?
- Where are Notepad++ macros stored?
- How to check about details of Notepad++ text editor
- Notepad++ Export file as HTML
- Indent/Prettify HTML File in Notepad++
- Notepad++ Reload - This file has been modified by another program. Do you want to reload it?
- List of Programming Languages Supported by Notepad++
- Notepad++ Editor alternatives for Mac OS X
- Add Custom header and footer to Windows Notepad file
- How to un-hide tab bar in notepad++
- Notepad++ is about to exit prompt message
- Launch Notepad++ html document in any web browser
- Word wrap text in Notepad++
- Disable Control Scroll Zoom-in and Zoom-out in Notepad++
- Word count in Notepad++
- Only Chessboard using HTML and CSS Code Example - CSS
- [Fix] Java Exception with Lambda - Cannot invoke because object is null - Java
- bash: command not found error [macOS Terminal Linux, Unix or Windows] - MacOS
- Java monitoring and management console [jconsole] - Java
- Hurry! Uninstall Adobe Flash Player - End Of Life, support end in December 2020 - News
- Fix error The tool was unable to install the Web Server (IIS) Role during SharePoint 2019 Setup - SharePoint
- How to know the MAC address of iPhone/iPad Wifi - iOS
- Change Mac Default Browser [updated for macOS Ventura] - MacOS