A simple notepad application in C#/WPF that can load and save files in plain text or using the .net encryption functionality.
This application is available in code only format, for a user to read, understand, and build for their own applications and purposes. This software is provided "as-is" in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. In no event will the authors be held liable for any damages arising from the use of this software.
See EncryptOperations.cs for the "real" operation, and MainWindow.xaml.cs for code that calls it.
A protected file that you understand is a decent place for password storage. Keep backups of any file in case you typo the password.