diff --git a/etc/visual-studio/libopenthread.vcxproj b/etc/visual-studio/libopenthread.vcxproj
index 4b36dc31d..83f566698 100644
--- a/etc/visual-studio/libopenthread.vcxproj
+++ b/etc/visual-studio/libopenthread.vcxproj
@@ -113,7 +113,6 @@
     <ClCompile Include="..\..\src\core\net\ip6_routes.cpp" />
     <ClCompile Include="..\..\src\core\net\netif.cpp" />
     <ClCompile Include="..\..\src\core\net\udp6.cpp" />
-    <ClCompile Include="..\..\src\core\openthread.cpp" />
     <ClCompile Include="..\..\src\core\thread\address_resolver.cpp" />
     <ClCompile Include="..\..\src\core\thread\announce_begin_server.cpp" />
     <ClCompile Include="..\..\src\core\thread\energy_scan_server.cpp" />
diff --git a/etc/visual-studio/libopenthread.vcxproj.filters b/etc/visual-studio/libopenthread.vcxproj.filters
index 002f292b5..f62cc292f 100644
--- a/etc/visual-studio/libopenthread.vcxproj.filters
+++ b/etc/visual-studio/libopenthread.vcxproj.filters
@@ -219,9 +219,6 @@
     <ClCompile Include="..\..\src\core\net\udp6.cpp">
       <Filter>Source Files\net</Filter>
     </ClCompile>
-    <ClCompile Include="..\..\src\core\openthread.cpp">
-      <Filter>Source Files</Filter>
-    </ClCompile>
     <ClCompile Include="..\..\src\core\mac\mac_blacklist.cpp">
       <Filter>Source Files\mac</Filter>
     </ClCompile>
diff --git a/etc/visual-studio/libopenthread_k.vcxproj b/etc/visual-studio/libopenthread_k.vcxproj
index 46c70cb82..6d5ad7d2c 100644
--- a/etc/visual-studio/libopenthread_k.vcxproj
+++ b/etc/visual-studio/libopenthread_k.vcxproj
@@ -120,7 +120,6 @@
     <ClCompile Include="..\..\src\core\net\ip6_routes.cpp" />
     <ClCompile Include="..\..\src\core\net\netif.cpp" />
     <ClCompile Include="..\..\src\core\net\udp6.cpp" />
-    <ClCompile Include="..\..\src\core\openthread.cpp" />
     <ClCompile Include="..\..\src\core\thread\address_resolver.cpp" />
     <ClCompile Include="..\..\src\core\thread\announce_begin_server.cpp" />
     <ClCompile Include="..\..\src\core\thread\energy_scan_server.cpp" />
diff --git a/etc/visual-studio/libopenthread_k.vcxproj.filters b/etc/visual-studio/libopenthread_k.vcxproj.filters
index 93fd33b83..f02bd02e9 100644
--- a/etc/visual-studio/libopenthread_k.vcxproj.filters
+++ b/etc/visual-studio/libopenthread_k.vcxproj.filters
@@ -222,9 +222,6 @@
     <ClCompile Include="..\..\src\core\net\udp6.cpp">
       <Filter>Source Files\net</Filter>
     </ClCompile>
-    <ClCompile Include="..\..\src\core\openthread.cpp">
-      <Filter>Source Files</Filter>
-    </ClCompile>
     <ClCompile Include="..\..\src\core\mac\mac_blacklist.cpp">
       <Filter>Source Files\mac</Filter>
     </ClCompile>
diff --git a/src/core/Makefile.am b/src/core/Makefile.am
index 086029e34..69c453c12 100644
--- a/src/core/Makefile.am
+++ b/src/core/Makefile.am
@@ -39,7 +39,6 @@ CPPFLAGS_COMMON                     = \
     $(NULL)
 
 SOURCES_COMMON                      = \
-    openthread.cpp                    \
     api/crypto_api.cpp                \
     api/dataset_api.cpp               \
     api/icmp6_api.cpp                 \
diff --git a/src/core/openthread.cpp b/src/core/openthread.cpp
deleted file mode 100644
index b08966748..000000000
--- a/src/core/openthread.cpp
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- *  Copyright (c) 2016, The OpenThread Authors.
- *  All rights reserved.
- *
- *  Redistribution and use in source and binary forms, with or without
- *  modification, are permitted provided that the following conditions are met:
- *  1. Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- *  2. Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *  3. Neither the name of the copyright holder nor the
- *     names of its contributors may be used to endorse or promote products
- *     derived from this software without specific prior written permission.
- *
- *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- *  POSSIBILITY OF SUCH DAMAGE.
- */
-
-/**
- * @file
- *   This file implements the top-level interface to the OpenThread stack.
- */
-
-#define WPP_NAME "openthread.tmh"
-
-#ifdef OPENTHREAD_CONFIG_FILE
-#include OPENTHREAD_CONFIG_FILE
-#else
-#include <openthread-config.h>
-#endif
-
-#include "openthread/openthread.h"
-#include "openthread/platform/settings.h"
-#include "openthread/platform/radio.h"
-#include "openthread/platform/random.h"
-#include "openthread/platform/misc.h"
-
-#include <common/code_utils.hpp>
-#include <common/debug.hpp>
-#include <common/logging.hpp>
-#include <common/message.hpp>
-#include <common/new.hpp>
-#include <common/settings.hpp>
-#include <common/timer.hpp>
-#include <crypto/mbedtls.hpp>
-#include <net/icmp6.hpp>
-#include <net/ip6.hpp>
-#include <thread/thread_netif.hpp>
-#include <thread/thread_uris.hpp>
-#include <openthread-instance.h>
-#include <coap/coap_server.hpp>
-
-using namespace Thread;
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif