opening exe files, comercial version vs opensource

[Gily]

It there a reson why sometimes the app include in different ways??
why the different ways are needed and when should I use them?

#include <QComboBox>
 
 class QColor;
 class QWidget;
 
 class ColorListEditor : public QComboBox
 {
     Q_OBJECT
     Q_PROPERTY(QColor color READ color WRITE setColor USER true)

#include <QComboBox>

 class QColor;
 class QWidget;

 class ColorListEditor : public QComboBox
 {
     Q_OBJECT
     Q_PROPERTY(QColor color READ color WRITE setColor USER true)

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