To reproduce:
1. Select image files and a file which is not an image file.
2. Select "Create > Webpage"
3. Fill out the dialog "Webpage" as needed (directory).
4. Choose "Create".
-> During webpage creation you will see a message box "Format of the file <x> could not be determined. Would you like to continue?" (O.K.)
Then another message box is shown "Contact your dealer. Would you like to continue?".
