diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8ba68c4a13..258a1609f6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -90,6 +90,9 @@ if(UNIX)
 endif()
 if(WIN32)
   set(_gRPC_PLATFORM_WINDOWS ON)
+  if(CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
+    set(_gRPC_PLATFORM_UWP ON)
+  endif()
 endif()
 
 set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
@@ -107,6 +110,9 @@ if (MSVC)
   add_definitions(/wd4267)
   # TODO(jtattermusch): needed to build boringssl with VS2017, revisit later
   add_definitions(/wd4987 /wd4774 /wd4819 /wd4996 /wd4619)
+  if(_gRPC_PLATFORM_UWP)
+    add_definitions(-DGRPC_ARES=0)
+  endif()
 endif()
 
 if (gRPC_USE_PROTO_LITE)
@@ -177,6 +183,10 @@ file(MAKE_DIRECTORY ${_gRPC_PROTO_GENS_DIR})
 #     ``.proto`` files
 #
 function(protobuf_generate_grpc_cpp)
+  if(_gRPC_PLATFORM_UWP)
+    return()
+  endif()
+
   if(NOT ARGN)
     message(SEND_ERROR "Error: PROTOBUF_GENERATE_GRPC_CPP() called without any proto files")
     return()
@@ -218,6 +228,7 @@ function(protobuf_generate_grpc_cpp)
   endforeach()
 endfunction()
 
+if(NOT _gRPC_PLATFORM_UWP)
 add_custom_target(plugins
   DEPENDS
   grpc_cpp_plugin
@@ -247,6 +258,8 @@ add_custom_target(tools_cxx
 add_custom_target(tools
   DEPENDS tools_c tools_cxx)
 
+endif()
+
 if (gRPC_BUILD_TESTS)
 add_custom_target(buildtests_c)
 add_dependencies(buildtests_c algorithm_test)
@@ -4029,7 +4042,6 @@ foreach(_hdr
     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
   )
 endforeach()
-endif (gRPC_BUILD_CODEGEN)
 
 if (gRPC_BUILD_CODEGEN)
 
@@ -4040,6 +4052,7 @@ if (gRPC_INSTALL)
     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
   )
 endif()
+endif (gRPC_BUILD_CODEGEN)
 
 endif (gRPC_BUILD_CODEGEN)
 if (gRPC_BUILD_TESTS)
@@ -4163,7 +4176,7 @@ foreach(_hdr
     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
   )
 endforeach()
-endif (gRPC_BUILD_CODEGEN)
+
 
 if (gRPC_BUILD_CODEGEN)
 
@@ -4174,6 +4187,7 @@ if (gRPC_INSTALL)
     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
   )
 endif()
+endif (gRPC_BUILD_CODEGEN)
 
 endif (gRPC_BUILD_CODEGEN)
 if (gRPC_BUILD_TESTS)
@@ -5196,7 +5210,6 @@ foreach(_hdr
     DESTINATION "${gRPC_INSTALL_INCLUDEDIR}/${_path}"
   )
 endforeach()
-endif (gRPC_BUILD_CODEGEN)
 
 if (gRPC_BUILD_CODEGEN)
 
@@ -5207,6 +5220,7 @@ if (gRPC_INSTALL)
     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
   )
 endif()
+endif (gRPC_BUILD_CODEGEN)
 
 endif (gRPC_BUILD_CODEGEN)
 if (gRPC_BUILD_TESTS)
diff --git a/src/core/lib/iomgr/resource_quota.cc b/src/core/lib/iomgr/resource_quota.cc
index dffac348c5..a59becb046 100644
--- a/src/core/lib/iomgr/resource_quota.cc
+++ b/src/core/lib/iomgr/resource_quota.cc
@@ -940,7 +940,7 @@ void grpc_resource_user_alloc(grpc_resource_user* resource_user, size_t size,
 void grpc_resource_user_free(grpc_resource_user* resource_user, size_t size) {
   gpr_mu_lock(&resource_user->mu);
   grpc_resource_quota* resource_quota = resource_user->resource_quota;
-  gpr_atm prior = gpr_atm_no_barrier_fetch_add(&resource_quota->used, -size);
+  gpr_atm prior = gpr_atm_no_barrier_fetch_add(&resource_quota->used, -static_cast<gpr_atm>(size));
   GPR_ASSERT(prior >= static_cast<long>(size));
   bool was_zero_or_negative = resource_user->free_pool <= 0;
   resource_user->free_pool += static_cast<int64_t>(size);
diff --git a/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc b/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc
index 55efe0e9dd..f538f26edf 100644
--- a/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc
+++ b/src/core/lib/security/credentials/alts/check_gcp_environment_windows.cc
@@ -60,6 +60,8 @@ bool check_bios_data(const char* bios_data_file) {
 
 static void init_mu(void) { gpr_mu_init(&g_mu); }
 
+#if !defined(WINAPI_FAMILY) || WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP
+
 static bool run_powershell() {
   SECURITY_ATTRIBUTES sa;
   sa.nLength = sizeof(sa);
@@ -97,8 +99,12 @@ static bool run_powershell() {
   CloseHandle(h);
   return true;
 }
+#endif
 
 bool grpc_alts_is_running_on_gcp() {
+#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY != WINAPI_FAMILY_DESKTOP_APP)
+  g_is_on_compute_engine = false;
+#else
   gpr_once_init(&g_once, init_mu);
   gpr_mu_lock(&g_mu);
   if (!g_compute_engine_detection_done) {
@@ -108,6 +114,7 @@ bool grpc_alts_is_running_on_gcp() {
     g_compute_engine_detection_done = true;
   }
   gpr_mu_unlock(&g_mu);
+#endif
   return g_is_on_compute_engine;
 }