# MDESupportedProtocols A dictionary that declares which media sharing extension protocols an app supports. ## Discussion Add this key to your media app’s Info pane in Xcode to declare support for one or more media device extension protocols. Each dictionary entry maps a protocol identifier to an application identifier on the remote device: ```xml MDESupportedProtocols com.example.sharingprotocol com.example.myapplicationidentifier ``` The dictionary key is the protocol’s [`UTTypeIdentifier`](/documentation/BundleResources/Information-Property-List/UTExportedTypeDeclarations/UTTypeIdentifier), matching the value declared in a media device extension’s [`UTExportedTypeDeclarations`](/documentation/BundleResources/Information-Property-List/UTExportedTypeDeclarations). The string value is the app identifier that the protocol launches on the remote device. The value can be empty when the protocol targets no specific remote application. When a media device extension supporting one of the listed protocols is available on the system, or you set [`MDESupportsUniversalURLPlayback`](/documentation/BundleResources/Information-Property-List/MDESupportsUniversalURLPlayback) to `true` and any URL-playback supporting extension is available on the system, returns `true` and your app can observe routing events through . Use the launch mode to start your counterpart app on the remote device using the configured application identifier. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)