It seams that the issue may belong form the .cpp-extension's associated program.

Check if the .cpp-extension is associated to 'ggc1plus' executable instead of Visual Studio Code:

• in Windows 10 open Settings and search "Chose default app by file type" the associated app should be "Visual Studio Code".

• in Windows 7 the quick way to change an association is the following:

  • right-click a file with desired extension chose "Open with";
  • then chose Visual Studio Code;
  • (Important!) check the check-box ✔ to always open extension with the selected program.

• About this solution you can find more information on Stack Overflow here , or you can also associate the file extension (in Windows 7) as explained from Microsoft Learn going here.

Check if you have installed the "C/C++ extension for VS Code" You can find more information about this clicking here.