I am sorry for misleading you on that.
It appears that the source to the image is always processed via the Control.MapPathSecure
method. And thus, no mater what result the LoadImage returns, the MapPathSecure method always throws an exception for such URLs.
It seems to me that this is an entirely non-supported scenario. I can also suggest you to put this as a feature request in our public portal—http://feedback.telerik.com/Project/108/
Alternative solution is to always download the file on the server and loading it properly before loading RadImageEditor:
imageUrl = RadImageEditor1.ImageUrl;
(WebClient wc =
Of course, this process should be further updated so that the file is saved with the proper extension.
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Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items