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    <MultiplayerProtocol>true</MultiplayerProtocol>

    <MultiplayerProtocol Executable="MyExecutableForMultiplayer.exe">true</MultiplayerProtocol>

#include <XTaskQueue.h>
#include <XGameActivation.h>  
  
XTaskQueueHandle g_taskQueue;  
XTaskQueueRegistrationToken g_activationToken;  
  
void CALLBACK OnActivation(void* context, const XGameActivationInfo* activationInfo)  
{  
    if (activationInfo->type == XGameActivationType::AcceptedGameInvite)
    {
        if (activationInfo->inviteUri != nullptr)
        {
            std::string inviteString(activationInfo->inviteUri);
            auto pos = inviteString.find("handle=");
            auto handleId = inviteString.substr(pos + 7, 36);
            // Now call XblMultiplayerManagerJoinLobby
        }
    }
}  
  
void InitializeGame()  
{  
    XGameActivationRegisterForEvent(g_taskQueue, nullptr, OnActivation, &g_activationToken);  
}  
  
void ShutdownGame()  
{  
    XGameActivationUnregisterForEvent(g_activationToken, true);  
}  

    "ms-xbl-multiplayer://inviteHandleAccept?handle=%s&invitedXuid=%s&senderXuid=%s&context=%s"
    
    // for example:
    // "ms-xbl-multiplayer://inviteHandleAccept?handle=00000000-0000-1234-5678-1234567890ab&invitedXuid=1234567890123456&senderXuid=6543210987654321&context="

    "ms-xbl-multiplayer://activityHandleJoin?&handle=%s&joinerXuid=%s&joineeXuid=%s"

HRESULT hr = XblMultiplayerManagerJoinLobby(handleId, xblUserHandle);