Solution
1. Start MP Navigator EX and click the corresponding icon.
Click [Photo-1].
Click [Photo-1] on the [Custom Scan with One-click] tab or in the one-click mode screen to open the [Photo-1] dialog box.
In this example, "ArcSoft PhotoStudio" will be registered to [Photo-1].
2. Click [Photo-1] on the [Custom Scan with One-click] tab or in the one-click mode screen to open the [Photo-1] dialog box.
The name of currently registered application is displayed in [Application Settings].
If no application is registered, "Drag and drop an application icon here to register" is displayed in [Application Settings].
3. If you want to register or change the application registered to [Photo-1],
Drag and drop the ArcSoft PhotoStudio (or an application you want to register) icon to [Application Settings] ("Drag and drop an application icon here to register", if no application is registered).
After the application is registered, its name will be displayed in [Application Settings].
4. If you cannot locate the ArcSoft PhotoStudio (or an application you want to register) icon,
Click the [Set] button in [Application Settings] to display [Select Application] dialog box.
5. In [Select Application], select the executable file with the extension ".exe" (*1) in the folder with its name or the manufacturer's name and then click [Open].
6. After the application is registered, its name will be displayed in [Application Settings] on the [Photo-1] dialog box.
*1 If extensions are hidden in [Select Application],
If extensions are hidden, using the file explorer, click [Tools], and then click [Folder Options]. Click [View], then clear the [Hide extensions for known file types] checkbox.