diff --git a/3rdparty/cpprestsdk/include/pplx/pplxconv.h b/3rdparty/cpprestsdk/include/pplx/pplxconv.h
deleted file mode 100644
index fe791c1a6b9bba96d5b2df178c1c5f117390748b..0000000000000000000000000000000000000000
--- a/3rdparty/cpprestsdk/include/pplx/pplxconv.h
+++ /dev/null
@@ -1,84 +0,0 @@
-/***
-* ==++==
-*
-* Copyright (c) Microsoft Corporation. All rights reserved. 
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-* http://www.apache.org/licenses/LICENSE-2.0
-* 
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*
-* ==--==
-* =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
-*
-* Utilities to convert between PPL tasks and PPLX tasks
-*
-* For the latest on this and related APIs, please see http://casablanca.codeplex.com.
-*
-* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
-****/
-
-#pragma once
-
-#ifndef _PPLXCONV_H
-#define _PPLXCONV_H
-
-#ifndef _WIN32
-#error This is only supported on Windows
-#endif
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1700) && (_MSC_VER < 1800) && !CPPREST_FORCE_PPLX
-
-#include <ppltasks.h>
-#include "pplx/pplxtasks.h"
-
-namespace pplx
-{
-namespace _Ppl_conv_helpers
-{
-template<typename _Tc, typename _F>
-auto _Set_value(_Tc _Tcp, const _F& _Func) -> decltype(_Tcp.set(_Func())) { return _Tcp.set(_Func()); }
-
-template<typename _Tc, typename _F>
-auto _Set_value(_Tc _Tcp, const _F& _Func, ...) -> decltype(_Tcp.set()) { _Func(); return _Tcp.set(); }
-
-template<typename _TaskType, typename _OtherTaskType, typename _OtherTCEType>
-_OtherTaskType _Convert_task(_TaskType _Task)
-{
-    _OtherTCEType _Tc;
-    _Task.then([_Tc](_TaskType _Task2) {
-        try
-        {
-            _Ppl_conv_helpers::_Set_value(_Tc, [=]{ return _Task2.get(); });
-        }
-        catch(...)
-        {
-            _Tc.set_exception(std::current_exception());
-        }
-    });
-    _OtherTaskType _T_other(_Tc);
-    return _T_other;
-}
-}
-
-template<typename _TaskType>
-concurrency::task<_TaskType> pplx_task_to_concurrency_task(pplx::task<_TaskType> _Task)
-{
-    return _Ppl_conv_helpers::_Convert_task<typename pplx::task<_TaskType>, concurrency::task<_TaskType>, concurrency::task_completion_event<_TaskType>>(_Task);
-}
-
-template<typename _TaskType>
-pplx::task<_TaskType> concurrency_task_to_pplx_task(concurrency::task<_TaskType> _Task)
-{
-    return _Ppl_conv_helpers::_Convert_task<typename concurrency::task<_TaskType>, pplx::task<_TaskType>, pplx::task_completion_event<_TaskType>>(_Task);
-}
-} // namespace pplx
-
-#endif
-
-#endif // _PPLXCONV_H