You can open
Select an item
. There you will find the ItemSelector declaration
the ItemSelector support modes. If you set it to all you will be able to select video files as well
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.