Windows VCL program:
1. Open .dproj Delphi project file with a text editor.
2. Search for the keyword "<Icon_MainIcon>", find Icon_MainIcon elements.
3. The contents of all elements Icon_MainIcon delete (delete the content between <Icon_MainIcon> and </ Icon_MainIcon>).
4. Save the file.
Validation results:
Reopen Delphi project, open the Options window project.
In the Project Options window on the left: Select the application - icon.
In the Options window on the right side project: the application icon displays a blank icon, it has been removed Delphi default icon.
Please clean up project to recompile and clear the windows icon cache system.
Other programming languages:
C++ :
When registration window class hIcon = NULL;