Prevent changing the extension of an .exe file

I am looking for a skilled developer who can help me prevent the extension of an .exe file from being changed. The project requirements are as follows:

Operating System: Windows
- The solution should be compatible with the Windows operating system.

Purpose of .exe file: Utility Tool
- The .exe file is intended to serve as a utility tool, providing specific functionalities to the user.

Security Measures: Anti-Modification and Password Protection
- The .exe file should have both anti-modification measures in place to prevent unauthorized changes, as well as password protection to ensure only authorized users can access and use the tool.

Ideal Skills and Experience:
- Proficiency in Windows programming and familiarity with .exe file handling.
- Experience in implementing security measures such as anti-modification and password protection.
- Strong attention to detail to ensure the integrity and security of the .exe file.
- Ability to deliver a reliable and user-friendly solution.

If you have the required skills and experience, I would like to hear from you. Please provide examples of your previous work in this area.