As I said, are you sure the strings are the same, neither of the strings you posted is produced by RTB control. You should paste an image to the control and get the generated rtf codes from the controls Rtf property and compare with what you get from the library. If there is any difference you should look into it. As you also know you can take the Rtf generated when pasting the image and assign and empty RTB control and it will display the same image, so the error must be with the string produced by the library somehow. I can confirm the string you posted does not produce an image in RTB control, but I can't tell you why as I don't have the image that should produce that code in RTB control.

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