In 4D v6.7, when you create an application that is compiled and merged with 4D Engine, you need to include the "4D Extensions" folder with the application you distribute. For example:

On Windows, you need to have a "4D Extensions" folder in the same folder as your compiled and merged ".EXE" structure file. (If you're using any plug-ins, you'll also need to have a "Win4DX" folder at the same level.)

On Macintosh, you need to have a "4D Extensions" folder in the same folder as your compiled and merged structure file. (If you're using any plug-ins, you'll also need to have a "Mac4DX" folder at the same level.)

For an explanation of why the files in the "4D Extensions" folder are needed, see the tech tip "The FormWiz file is needed"