There are tools on your Windows operating system that can restore CDD and EXE files to normal with relative ease. EXE, or executable files, are basically programs and cannot be read like data files. CDD files belong to the ConceptDraw Pro program, which allows users to create flowcharts, technical drawings and conceptual diagrams. These files can also contain scripting language in the ConceptDraw Basic application.
1). Press "Ctrl," "Shift" and "Esc" at the same time to open the Task Manager.
2). Click "File" and click "New Task (Run...)." Type "cmd" in the open field and click "OK."
3). Allow the Command Prompt to launch. Type the following command at the prompt and press "Enter":
This will run the System File Checker and repair any problems with the CDD and EXE files on your system. Exit the Command Prompt.