Hi Rasheed,
RadAsyncUpload can filter the dialog when Silverlight/Flash module is used. The issue that you described below is because of the Silverlight. There is a problem with the initialization of the Silvelright object. We are aware of that issue and unfortunately is out of our hands. Even if you select a file with a different extension than allowed by the AllowedFileExtensions property, the file will appears as an invalid with a red dot in front.
Greetings,
Peter Filipov
the Telerik team
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