Thank you for your interest in our RadFileDialogs controls.
Our FileDialogs for WPF does not provide a way to remove the warning. We have recently logged a feature request in our Feedback Portal to provide such functionality out of the box. You can vote for its implementation. By voting, you are increasing its priority. In case this request is of interest to more people and gathers enough votes so its priority gets high enough, then we will consider it and make it part of our future plans.
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