Wallpaper Protector

Professional Windows utility that prevents unauthorized desktop wallpaper changes. Features real-time monitoring, registry protection, and Windows startup integration. Built with C# and .NET for maximum reliability.

Overview

This application ensures a specific wallpaper remains set on Windows systems, reverting unauthorized changes. Ideal for educational institutions, corporate environments, or personal use where maintaining a consistent desktop appearance is required.

Key Features

• Real-time Monitoring - Checks wallpaper every 2 seconds, instantly reverting changes
• Registry Protection - Locks wallpaper settings through Windows Registry policies
• Auto-Start Integration - Optional startup with Windows (silent mode available)
• Custom Wallpaper Support - Set any image as the protected wallpaper
• Complete Cleanup - Full registry restoration and wallpaper reset on unlock
• Explorer Integration - Automatic restart of Explorer.exe for complete reset
• Administrator Control - Requires admin rights for full functionality

Technology Stack

Component	Technology
Platform	Windows x64
UI	Console Application
Registry	Microsoft.Win32
Framework	.NET 8.0-windows
Runtime	Self-contained executable
Image Processing	System.Drawing.Common
System APIs	P/Invoke (user32.dll, kernel32.dll)

Installation

# Clone repository
git clone https://github.com/yourusername/wallpaper-protector.git

# Navigate to project
cd wallpaper-protector

# Restore dependencies
dotnet restore

# Build project
dotnet build -c Release

# Publish self-contained executable
dotnet publish -c Release -r win-x64 --self-contained true

Silent Mode

Run with /silent parameter for background operation:

WallpaperProtector.exe /silent

Menu Options Explained

Option	Function
1. Lock & Protect	Activates wallpaper protection, creates default wallpaper, locks registry
2. Unlock & Remove	Complete cleanup: removes registry locks, restores default settings, restarts Explorer
3. Set Custom Wallpaper	Copies and sets any image as the protected wallpaper
4. Check Status	Displays current protection status, registry state, and wallpaper information
5. Install Auto-Start	Adds program to Windows startup with silent mode
X. Exit	Stops monitoring and exits application

What Happens When You Unlock

The Unlock & Remove option performs complete cleanup:

1. Stops Background Monitor - Ends the wallpaper checking thread
2. Registry Cleanup:
   • Deletes NoDispBackgroundPage, NoDisplayBackground, NoChangingWallPaper
   • Removes entire Policies\System and Policies\ActiveDesktop trees
3. Restores Default Settings:
   • Resets Wallpaper to empty
   • Sets WallpaperStyle = 10 (Fill)
   • Sets TileWallpaper = 0
4. Forces Wallpaper Update via SystemParametersInfo
5. Restarts Windows Explorer for complete reset
6. Opens Settings to ms-settings:personalization-background

Project Structure

wallpaper-protector/
├── Program.cs           # Main application code
├── protector.csproj     # Project configuration
├── README.md           # Documentation
└── bin/                # Build output (after compilation)
    └── Release/
        └── win-x64/
            └── publish/ # Self-contained executable

Requirements

• Operating System: Windows 10/11 (x64)
• .NET Runtime: Self-contained (no runtime installation needed)
• Permissions: Administrator rights for registry operations
• Disk Space: ~50MB for published application

Important

Administrator privileges are required. The application will restart with admin rights when needed.

Legal Disclaimer

Caution

This software modifies Windows Registry and system behavior. While designed to be safe, improper use could affect system stability. Authors assume no responsibility for any issues. Please use at your own risk.

Important Notes

• Registry modifications are isolated to HKEY_CURRENT_USER (current user only)
• All changes are fully reversible via the Unlock option
• The wallpaper is stored at C:\Windows\Web\Wallpaper\School\default.jpg
• Silent mode runs without any visible interface
• Explorer restart may cause temporary screen flicker

Troubleshooting

Q: Wallpaper keeps reverting even after Unlock?
A: Ensure you've stopped the background monitor. If issues persist, restart your computer.

Q: Can't set custom wallpaper?
A: Verify the image file exists and is accessible. Supported formats: JPEG, PNG, BMP.

Q: Auto-start not working?
A: Check that the shortcut exists in %APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup

Q: Registry keys not deleting?
A: Ensure you're running as Administrator. Some keys may require Group Policy overrides.

Contributing

Contributions are welcome! Please ensure:

• Code follows existing patterns and practices
• Registry operations include proper error handling
• Changes are tested on Windows 10/11
• Documentation is updated accordingly

License

This project is licensed under the MIT License. See LICENSE file for details.

Educational Context

Developed as a system administration utility demonstrating:

• Windows Registry manipulation
• System API integration (P/Invoke)
• Background process management
• Windows startup integration
• File system operations
• Security and permission handling

Note

This tool is intended for legitimate system administration purposes only. Please ensure you have explicit proper written authorization before deploying or installing on any system you do not personally own.