diff --git a/change/@office-iss-react-native-win32-2020-02-10-23-09-16-platform-constants.json b/change/@office-iss-react-native-win32-2020-02-10-23-09-16-platform-constants.json
new file mode 100644
index 0000000000..ab929b8816
--- /dev/null
+++ b/change/@office-iss-react-native-win32-2020-02-10-23-09-16-platform-constants.json
@@ -0,0 +1,9 @@
+{
+  "type": "prerelease",
+  "comment": "Provide a Minimal PlatformConstants Implementation",
+  "packageName": "@office-iss/react-native-win32",
+  "email": "ngerlem@microsoft.com",
+  "commit": "cae1620822a386c4a52fb7351e922485d4f81ac1",
+  "dependentChangeType": "patch",
+  "date": "2020-02-11T07:09:14.058Z"
+}
\ No newline at end of file
diff --git a/change/react-native-windows-2020-02-10-23-09-16-platform-constants.json b/change/react-native-windows-2020-02-10-23-09-16-platform-constants.json
new file mode 100644
index 0000000000..5d36445513
--- /dev/null
+++ b/change/react-native-windows-2020-02-10-23-09-16-platform-constants.json
@@ -0,0 +1,9 @@
+{
+  "type": "prerelease",
+  "comment": "Provide a Minimal PlatformConstants Implementation",
+  "packageName": "react-native-windows",
+  "email": "ngerlem@microsoft.com",
+  "commit": "cae1620822a386c4a52fb7351e922485d4f81ac1",
+  "dependentChangeType": "patch",
+  "date": "2020-02-11T07:09:16.192Z"
+}
\ No newline at end of file
diff --git a/packages/react-native-win32/src/Libraries/Utilities/NativePlatformConstantsWin.js b/packages/react-native-win32/src/Libraries/Utilities/NativePlatformConstantsWin.js
new file mode 100644
index 0000000000..fcaac84584
--- /dev/null
+++ b/packages/react-native-win32/src/Libraries/Utilities/NativePlatformConstantsWin.js
@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License.
+ * 
+ * @format
+ * @flow
+ */
+
+'use strict';
+
+import type {TurboModule} from '../TurboModule/RCTExport';
+import * as TurboModuleRegistry from '../TurboModule/TurboModuleRegistry';
+
+export interface Spec extends TurboModule {
+  +getConstants: () => {|
+    isTesting: boolean,
+    reactNativeVersion: {|
+      major: number,
+      minor: number,
+      patch: number,
+      prerelease: ?number,
+    |},
+  |};
+}
+
+export default (TurboModuleRegistry.getEnforcing<Spec>(
+  'PlatformConstants',
+): Spec);
diff --git a/packages/react-native-win32/src/Libraries/Utilities/Platform.win32.js b/packages/react-native-win32/src/Libraries/Utilities/Platform.win32.js
index 055da8c72f..c5237c55c5 100644
--- a/packages/react-native-win32/src/Libraries/Utilities/Platform.win32.js
+++ b/packages/react-native-win32/src/Libraries/Utilities/Platform.win32.js
@@ -8,23 +8,41 @@
 
 'use strict';
 
-const NativeModules = require('../BatchedBridge/NativeModules');
+import NativePlatformConstantsWin from './NativePlatformConstantsWin';
+
+export type PlatformSelectSpec<D, I> = {
+  default?: D,
+  win32?: I,
+};
 
 const Platform = {
+  __constants: null,
   OS: 'win32',
-  get Version() {
-    const constants = NativeModules.PlatformConstants;
-    return constants && constants.Version;
+  get constants(): {|
+    isTesting: boolean,
+    reactNativeVersion: {|
+      major: number,
+      minor: number,
+      patch: number,
+      prerelease: ?number,
+    |},
+  |} {
+    if (this.__constants == null) {
+      this.__constants = NativePlatformConstantsWin.getConstants();
+    }
+    return this.__constants;
   },
   get isTesting(): boolean {
-    const constants = NativeModules.PlatformConstants;
-    return constants && constants.isTesting;
+    if (__DEV__) {
+      return this.constants.isTesting;
+    }
+    return false;
   },
-  select: (obj: Object) => ('win32' in obj ? obj.win32 : obj.default),
   get isTV() {
-    const constants = NativeModules.PlatformConstants;
-    return constants ? constants.interfaceIdiom === 'tv' : false;
+    return false;
   },
+  select: <D, I>(spec: PlatformSelectSpec<D, I>): D | I =>
+    'win32' in spec ? spec.win32 : spec.default,
 };
 
 module.exports = Platform;
diff --git a/packages/react-native-win32/src/Libraries/core/ReactNativeVersionCheck.win32.js b/packages/react-native-win32/src/Libraries/core/ReactNativeVersionCheck.win32.js
index d336163787..3673313e70 100644
--- a/packages/react-native-win32/src/Libraries/core/ReactNativeVersionCheck.win32.js
+++ b/packages/react-native-win32/src/Libraries/core/ReactNativeVersionCheck.win32.js
@@ -23,7 +23,7 @@ const ReactNativeVersion = require('./ReactNativeVersion');
  */
 exports.checkVersions = function checkVersions(): void {
   // [Windows
-  // $FlowFixMe constants doesn't exist yet
+  // This can be removed once devmain adopts 0.61
   if (!Platform.constants) {
     return;
   }
diff --git a/vnext/.flowconfig b/vnext/.flowconfig
index c7e5a313f0..cae67e9402 100644
--- a/vnext/.flowconfig
+++ b/vnext/.flowconfig
@@ -13,7 +13,6 @@
 <PROJECT_ROOT>/Libraries/AppTheme/AppTheme.js
 <PROJECT_ROOT>/Libraries/Color/normalizeColor.js
 <PROJECT_ROOT>/Libraries/Core/setUpDeveloperTools.js
-<PROJECT_ROOT>/Libraries/Core/ReactNativeVersionCheck.js
 <PROJECT_ROOT>/Libraries/Components/ActivityIndicator/RCTActivityIndicatorViewNativeComponent.js
 <PROJECT_ROOT>/Libraries/Components/Button.js
 <PROJECT_ROOT>/Libraries/Components/DatePicker/DatePicker.js
diff --git a/vnext/Desktop.IntegrationTests/DesktopTestRunner.cpp b/vnext/Desktop.IntegrationTests/DesktopTestRunner.cpp
index 3695fb1418..a1b904e23e 100644
--- a/vnext/Desktop.IntegrationTests/DesktopTestRunner.cpp
+++ b/vnext/Desktop.IntegrationTests/DesktopTestRunner.cpp
@@ -7,8 +7,8 @@
 #include <IUIManager.h>
 #include <Modules/AppStateModule.h>
 #include <Modules/NetworkingModule.h>
+#include <Modules/WebSocketModule.h>
 #include <NativeModuleFactories.h>
-#include <WebSocketModule.h>
 #include "ChakraRuntimeHolder.h"
 #include "DesktopTestInstance.h"
 #include "TestMessageQueueThread.h"
diff --git a/vnext/Desktop.IntegrationTests/WebSocketModuleIntegrationTest.cpp b/vnext/Desktop.IntegrationTests/WebSocketModuleIntegrationTest.cpp
index 8601820fb4..16923d8225 100644
--- a/vnext/Desktop.IntegrationTests/WebSocketModuleIntegrationTest.cpp
+++ b/vnext/Desktop.IntegrationTests/WebSocketModuleIntegrationTest.cpp
@@ -3,7 +3,7 @@
 
 #include <CppUnitTest.h>
 
-#include <WebSocketModule.h>
+#include <Modules/WebSocketModule.h>
 
 using namespace facebook::react;
 using namespace folly;
diff --git a/vnext/Desktop.UnitTests/WebSocketModuleTest.cpp b/vnext/Desktop.UnitTests/WebSocketModuleTest.cpp
index ea8c521551..cced3d4ab5 100644
--- a/vnext/Desktop.UnitTests/WebSocketModuleTest.cpp
+++ b/vnext/Desktop.UnitTests/WebSocketModuleTest.cpp
@@ -2,7 +2,7 @@
 // Licensed under the MIT License.
 
 #include <CppUnitTest.h>
-#include <WebSocketModule.h>
+#include <Modules/WebSocketModule.h>
 
 using namespace facebook::react;
 using namespace facebook::xplat::module;
diff --git a/vnext/Desktop/Modules/WebSocketModule.cpp b/vnext/Desktop/Modules/WebSocketModule.cpp
index 134b3c1067..63696e1245 100644
--- a/vnext/Desktop/Modules/WebSocketModule.cpp
+++ b/vnext/Desktop/Modules/WebSocketModule.cpp
@@ -3,7 +3,7 @@
 
 #include "pch.h"
 
-#include <WebSocketModule.h>
+#include <Modules/WebSocketModule.h>
 
 #include <cxxreact/Instance.h>
 #include <cxxreact/JsArgumentHelpers.h>
diff --git a/vnext/Desktop/React.Windows.Desktop.vcxproj b/vnext/Desktop/React.Windows.Desktop.vcxproj
index e597d3bbdf..df9052a76d 100644
--- a/vnext/Desktop/React.Windows.Desktop.vcxproj
+++ b/vnext/Desktop/React.Windows.Desktop.vcxproj
@@ -93,9 +93,9 @@
     <ClCompile Include="DevSupportManager.cpp" />
     <ClCompile Include="Executors\WebSocketJSExecutor.cpp" />
     <ClCompile Include="Executors\WebSocketJSExecutorFactory.cpp" />
+    <ClCompile Include="JSBigStringResourceDll.cpp" />
     <ClCompile Include="LazyDevSupportManager.cpp" />
     <ClCompile Include="Modules\NetworkingModule.cpp" />
-    <ClCompile Include="JSBigStringResourceDll.cpp" />
     <ClCompile Include="Modules\TimingModule.cpp" />
     <ClCompile Include="Modules\WebSocketModule.cpp" />
     <ClCompile Include="pch.cpp">
diff --git a/vnext/ReactWindowsCore/Modules/PlatformConstantsModule.cpp b/vnext/ReactWindowsCore/Modules/PlatformConstantsModule.cpp
new file mode 100644
index 0000000000..30706618d0
--- /dev/null
+++ b/vnext/ReactWindowsCore/Modules/PlatformConstantsModule.cpp
@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+#include "PlatformConstantsModule.h"
+#include <VersionHelpers.h>
+
+using Method = facebook::xplat::module::CxxModule::Method;
+
+namespace facebook::react {
+
+const char *PlatformConstantsModule::Name = "PlatformConstants";
+
+std::string PlatformConstantsModule::getName() {
+  return PlatformConstantsModule::Name;
+}
+
+std::vector<Method> PlatformConstantsModule::getMethods() {
+  return {};
+}
+
+std::map<std::string, folly::dynamic> PlatformConstantsModule::getConstants() {
+  return {
+      // We don't currently treat Native code differently in a test environment
+      {"isTesting", false},
+
+      // Since we're out-of-tree, we don't know the exact version of React Native
+      // we're paired with. Provide something sane for now, and try to provide a
+      // better source of truth later. Tracked by Issue #4073
+      {"reactNativeVersion", folly::dynamic::object("major", 0)("minor", 61)("patch", 0)}
+
+      // We don't provide the typical OS version here. Windows make it hard to
+      // get an exact version by-design. In the future we should consider
+      // exposing something here like a facility to check Universal API
+      // Contract.
+  };
+}
+
+} // namespace facebook::react
diff --git a/vnext/ReactWindowsCore/Modules/PlatformConstantsModule.h b/vnext/ReactWindowsCore/Modules/PlatformConstantsModule.h
new file mode 100644
index 0000000000..5bfcabedc2
--- /dev/null
+++ b/vnext/ReactWindowsCore/Modules/PlatformConstantsModule.h
@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+#pragma once
+
+#include <cxxreact/CxxModule.h>
+
+namespace facebook::react {
+
+class PlatformConstantsModule : public facebook::xplat::module::CxxModule {
+ public:
+  static const char *Name;
+
+  std::string getName() override;
+  std::map<std::string, folly::dynamic> getConstants() override;
+  std::vector<Method> getMethods() override;
+};
+
+} // namespace facebook::react
diff --git a/vnext/ReactWindowsCore/Modules/SourceCodeModule.cpp b/vnext/ReactWindowsCore/Modules/SourceCodeModule.cpp
index a59184e56d..b55dc42bb9 100644
--- a/vnext/ReactWindowsCore/Modules/SourceCodeModule.cpp
+++ b/vnext/ReactWindowsCore/Modules/SourceCodeModule.cpp
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-#include <ReactWindowsCore/SourceCodeModule.h>
+#include "SourceCodeModule.h"
 
 using namespace folly;
 using namespace facebook::xplat;
@@ -9,12 +9,12 @@ using namespace facebook::xplat;
 namespace facebook {
 namespace react {
 
-const char *SourceCodeModule::name = "SourceCode";
+const char *SourceCodeModule::Name = "SourceCode";
 
 SourceCodeModule::SourceCodeModule(const std::string &bundleUrl) : m_bundleUrl(bundleUrl) {}
 
 std::string SourceCodeModule::getName() {
-  return name;
+  return Name;
 }
 
 auto SourceCodeModule::getConstants() -> std::map<std::string, dynamic> {
diff --git a/vnext/include/ReactWindowsCore/SourceCodeModule.h b/vnext/ReactWindowsCore/Modules/SourceCodeModule.h
similarity index 96%
rename from vnext/include/ReactWindowsCore/SourceCodeModule.h
rename to vnext/ReactWindowsCore/Modules/SourceCodeModule.h
index 16747eae2c..29228033f2 100644
--- a/vnext/include/ReactWindowsCore/SourceCodeModule.h
+++ b/vnext/ReactWindowsCore/Modules/SourceCodeModule.h
@@ -20,7 +20,7 @@ class SourceCodeModule : public facebook::xplat::module::CxxModule {
   virtual auto getConstants() -> std::map<std::string, folly::dynamic>;
   virtual auto getMethods() -> std::vector<Method>;
 
-  static const char *name;
+  static const char *Name;
 
  private:
   std::string m_bundleUrl;
diff --git a/vnext/ReactWindowsCore/WebSocketModule.h b/vnext/ReactWindowsCore/Modules/WebSocketModule.h
similarity index 100%
rename from vnext/ReactWindowsCore/WebSocketModule.h
rename to vnext/ReactWindowsCore/Modules/WebSocketModule.h
diff --git a/vnext/ReactWindowsCore/ReactWindowsCore.vcxproj b/vnext/ReactWindowsCore/ReactWindowsCore.vcxproj
index d94f2172ce..a95a17fc43 100644
--- a/vnext/ReactWindowsCore/ReactWindowsCore.vcxproj
+++ b/vnext/ReactWindowsCore/ReactWindowsCore.vcxproj
@@ -127,7 +127,10 @@
     <ClInclude Include="Modules\AppThemeModule.h" />
     <ClInclude Include="Modules\ExceptionsManagerModule.h" />
     <ClInclude Include="Modules\I18nModule.h" />
+    <ClInclude Include="Modules\PlatformConstantsModule.h" />
+    <ClInclude Include="Modules\SourceCodeModule.h" />
     <ClInclude Include="Modules\UIManagerModule.h" />
+    <ClInclude Include="Modules\WebSocketModule.h" />
     <ClInclude Include="NativeModuleProvider.h" />
     <ClInclude Include="OInstance.h" />
     <ClInclude Include="pch.h" />
@@ -139,7 +142,6 @@
     <ClInclude Include="Tracing.h" />
     <ClInclude Include="Utils.h" />
     <ClInclude Include="WebSocketJSExecutorFactory.h" />
-    <ClInclude Include="WebSocketModule.h" />
     <ClInclude Include="ChakraRuntimeHolder.h" Condition="'$(PATCH_RN)' == 'true'" />
     <ClInclude Include="HermesRuntimeHolder.h" Condition="'$(PATCH_RN)' == 'true' AND '$(USE_HERMES)' == 'true'" />
     <ClInclude Include="V8JSIRuntimeHolder.h" Condition="'$(PATCH_RN)' == 'true' AND '$(USE_V8)' == 'true'" />
@@ -158,6 +160,7 @@
     <ClCompile Include="Modules\AsyncStorageModule.cpp" />
     <ClCompile Include="Modules\ExceptionsManagerModule.cpp" />
     <ClCompile Include="Modules\I18nModule.cpp" />
+    <ClCompile Include="Modules\PlatformConstantsModule.cpp" />
     <ClCompile Include="Modules\SourceCodeModule.cpp" />
     <ClCompile Include="Modules\UIManagerModule.cpp" />
     <ClCompile Include="pch.cpp">
diff --git a/vnext/ReactWindowsCore/ReactWindowsCore.vcxproj.filters b/vnext/ReactWindowsCore/ReactWindowsCore.vcxproj.filters
index cafca865e8..a51a4920c6 100644
--- a/vnext/ReactWindowsCore/ReactWindowsCore.vcxproj.filters
+++ b/vnext/ReactWindowsCore/ReactWindowsCore.vcxproj.filters
@@ -72,6 +72,9 @@
     <ClCompile Include="Modules\I18nModule.cpp">
       <Filter>Source Files\Modules</Filter>
     </ClCompile>
+    <ClCompile Include="Modules\PlatformConstantsModule.cpp">
+      <Filter>Source Files\Modules</Filter>
+    </ClCompile>
     <ClCompile Include="Modules\SourceCodeModule.cpp">
       <Filter>Source Files\Modules</Filter>
     </ClCompile>
@@ -191,9 +194,15 @@
     <ClInclude Include="Modules\I18nModule.h">
       <Filter>Header Files\Modules</Filter>
     </ClInclude>
+    <ClInclude Include="Modules\PlatformConstantsModule.h">
+      <Filter>Header Files\Modules</Filter>
+    </ClInclude>
     <ClInclude Include="Modules\UIManagerModule.h">
       <Filter>Header Files\Modules</Filter>
     </ClInclude>
+    <ClInclude Include="Modules\WebSocketModule.h">
+      <Filter>Header Files\Modules</Filter>
+    </ClInclude>
     <ClInclude Include="NativeModuleProvider.h">
       <Filter>Header Files</Filter>
     </ClInclude>
@@ -227,9 +236,7 @@
     <ClInclude Include="WebSocketJSExecutorFactory.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="WebSocketModule.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
+    <ClInclude Include="Modules\SourceCodeModule.h" />
   </ItemGroup>
   <ItemGroup>
     <None Include="etw\react_native_windows.man">
diff --git a/vnext/Shared/OInstance.cpp b/vnext/Shared/OInstance.cpp
index 99e03627f8..d146d24e16 100644
--- a/vnext/Shared/OInstance.cpp
+++ b/vnext/Shared/OInstance.cpp
@@ -27,10 +27,11 @@
 #include <cxxreact/ModuleRegistry.h>
 
 #if (defined(_MSC_VER) && !defined(WINRT))
-#include <WebSocketModule.h>
+#include <Modules/WebSocketModule.h>
 #endif
 #include <Modules/ExceptionsManagerModule.h>
-#include <SourceCodeModule.h>
+#include <Modules/PlatformConstantsModule.h>
+#include <Modules/SourceCodeModule.h>
 
 #if (defined(_MSC_VER) && (defined(WINRT)))
 #include <Utils/LocalBundleReader.h>
@@ -738,7 +739,7 @@ std::vector<std::unique_ptr<NativeModule>> InstanceImpl::GetDefaultNativeModules
       : std::string();
   modules.push_back(std::make_unique<CxxNativeModule>(
       m_innerInstance,
-      facebook::react::SourceCodeModule::name,
+      facebook::react::SourceCodeModule::Name,
       [bundleUrl]() -> std::unique_ptr<xplat::module::CxxModule> {
         return std::make_unique<SourceCodeModule>(bundleUrl);
       },
@@ -747,12 +748,17 @@ std::vector<std::unique_ptr<NativeModule>> InstanceImpl::GetDefaultNativeModules
   modules.push_back(std::make_unique<CxxNativeModule>(
       m_innerInstance,
       "ExceptionsManager",
-      [&]() -> std::unique_ptr<xplat::module::CxxModule> {
-        return std::make_unique<facebook::react::ExceptionsManagerModule>(
-            std::move(m_devSettings->jsExceptionCallback));
+      [callback{std::move(m_devSettings->jsExceptionCallback)}]() mutable {
+        return std::make_unique<ExceptionsManagerModule>(std::move(callback));
       },
       nativeQueue));
 
+  modules.push_back(std::make_unique<CxxNativeModule>(
+      m_innerInstance,
+      PlatformConstantsModule::Name,
+      []() { return std::make_unique<PlatformConstantsModule>(); },
+      nativeQueue));
+
   return modules;
 }
 
diff --git a/vnext/src/Libraries/Utilities/NativePlatformConstantsWin.js b/vnext/src/Libraries/Utilities/NativePlatformConstantsWin.js
new file mode 100644
index 0000000000..523a4f10f0
--- /dev/null
+++ b/vnext/src/Libraries/Utilities/NativePlatformConstantsWin.js
@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License.
+ *
+ * @format
+ * @flow
+ */
+
+'use strict';
+
+import type {TurboModule} from '../TurboModule/RCTExport';
+import * as TurboModuleRegistry from '../TurboModule/TurboModuleRegistry';
+
+export interface Spec extends TurboModule {
+  +getConstants: () => {|
+    isTesting: boolean,
+    reactNativeVersion: {|
+      major: number,
+      minor: number,
+      patch: number,
+      prerelease: ?number,
+    |},
+  |};
+}
+
+export default (TurboModuleRegistry.getEnforcing<Spec>(
+  'PlatformConstants',
+): Spec);
diff --git a/vnext/src/Libraries/Utilities/Platform.windesktop.js b/vnext/src/Libraries/Utilities/Platform.windesktop.js
index 77a3bdbb2c..0dc6066927 100644
--- a/vnext/src/Libraries/Utilities/Platform.windesktop.js
+++ b/vnext/src/Libraries/Utilities/Platform.windesktop.js
@@ -1,24 +1,48 @@
 /**
  * Copyright (c) Microsoft Corporation. All rights reserved.
  * Licensed under the MIT License.
+ *
  * @format
+ * @flow
  */
 
 'use strict';
 
-const NativeModules = require('../BatchedBridge/NativeModules');
+import NativePlatformConstantsWin from './NativePlatformConstantsWin';
+
+export type PlatformSelectSpec<D, I> = {
+  default?: D,
+  windesktop?: I,
+};
 
 const Platform = {
+  __constants: null,
   OS: 'windesktop',
-  get Version() {
-    const constants = NativeModules.PlatformConstants;
-    return constants && constants.Version;
+  get constants(): {|
+    isTesting: boolean,
+    reactNativeVersion: {|
+      major: number,
+      minor: number,
+      patch: number,
+      prerelease: ?number,
+    |},
+  |} {
+    if (this.__constants == null) {
+      this.__constants = NativePlatformConstantsWin.getConstants();
+    }
+    return this.__constants;
   },
   get isTesting(): boolean {
-    const constants = NativeModules.PlatformConstants;
-    return constants && constants.isTesting;
+    if (__DEV__) {
+      return this.constants.isTesting;
+    }
+    return false;
   },
-  select: (obj: Object) => ('windesktop' in obj ? obj.windesktop : obj.default),
+  get isTV() {
+    return false;
+  },
+  select: <D, I>(spec: PlatformSelectSpec<D, I>): D | I =>
+    'windesktop' in spec ? spec.windesktop : spec.default,
 };
 
 module.exports = Platform;
diff --git a/vnext/src/Libraries/Utilities/Platform.windows.js b/vnext/src/Libraries/Utilities/Platform.windows.js
index 5dcb1bfad8..be6dd3a3dd 100644
--- a/vnext/src/Libraries/Utilities/Platform.windows.js
+++ b/vnext/src/Libraries/Utilities/Platform.windows.js
@@ -8,23 +8,41 @@
 
 'use strict';
 
-const NativeModules = require('../BatchedBridge/NativeModules');
+import NativePlatformConstantsWin from './NativePlatformConstantsWin';
+
+export type PlatformSelectSpec<D, I> = {
+  default?: D,
+  windows?: I,
+};
 
 const Platform = {
+  __constants: null,
   OS: 'windows',
-  get Version() {
-    const constants = NativeModules.PlatformConstants;
-    return constants && constants.Version;
+  get constants(): {|
+    isTesting: boolean,
+    reactNativeVersion: {|
+      major: number,
+      minor: number,
+      patch: number,
+      prerelease: ?number,
+    |},
+  |} {
+    if (this.__constants == null) {
+      this.__constants = NativePlatformConstantsWin.getConstants();
+    }
+    return this.__constants;
   },
   get isTesting(): boolean {
-    const constants = NativeModules.PlatformConstants;
-    return constants && constants.isTesting;
+    if (__DEV__) {
+      return this.constants.isTesting;
+    }
+    return false;
   },
-  select: (obj: Object) => ('windows' in obj ? obj.windows : obj.default),
   get isTV() {
-    const constants = NativeModules.PlatformConstants;
-    return constants ? constants.interfaceIdiom === 'tv' : false;
+    return false;
   },
+  select: <D, I>(spec: PlatformSelectSpec<D, I>): D | I =>
+    'windows' in spec ? spec.windows : spec.default,
 };
 
 module.exports = Platform;
diff --git a/vnext/src/Libraries/core/ReactNativeVersionCheck.windesktop.js b/vnext/src/Libraries/core/ReactNativeVersionCheck.windesktop.js
deleted file mode 100644
index 3f566e2c84..0000000000
--- a/vnext/src/Libraries/core/ReactNativeVersionCheck.windesktop.js
+++ /dev/null
@@ -1,14 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow strict-local
- * @format
- */
-'use strict';
-
-exports.checkVersions = function checkVersions(): void {
-  return;
-};
diff --git a/vnext/src/Libraries/core/ReactNativeVersionCheck.windows.js b/vnext/src/Libraries/core/ReactNativeVersionCheck.windows.js
deleted file mode 100644
index 310b19e24e..0000000000
--- a/vnext/src/Libraries/core/ReactNativeVersionCheck.windows.js
+++ /dev/null
@@ -1,55 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow strict-local
- * @format
- */
-'use strict';
-
-import Platform from '../Utilities/Platform';
-const ReactNativeVersion = require('./ReactNativeVersion');
-
-/**
- * Checks that the version of this React Native JS is compatible with the native
- * code, throwing an error if it isn't.
- *
- * The existence of this module is part of the public interface of React Native
- * even though it is used only internally within React Native. React Native
- * implementations for other platforms (ex: Windows) may override this module
- * and rely on its existence as a separate module.
- */
-exports.checkVersions = function checkVersions(): void {
-  // [Windows
-  // $FlowFixMe Platform.contstants doesn't exist yet
-  if (!Platform.constants) {
-    return;
-  }
-  // Windows]
-
-  const nativeVersion = Platform.constants.reactNativeVersion;
-  if (
-    ReactNativeVersion.version.major !== nativeVersion.major ||
-    ReactNativeVersion.version.minor !== nativeVersion.minor
-  ) {
-    console.error(
-      `React Native version mismatch.\n\nJavaScript version: ${_formatVersion(
-        ReactNativeVersion.version,
-      )}\n` +
-        `Native version: ${_formatVersion(nativeVersion)}\n\n` +
-        'Make sure that you have rebuilt the native code. If the problem ' +
-        'persists try clearing the Watchman and packager caches with ' +
-        '`watchman watch-del-all && react-native start --reset-cache`.',
-    );
-  }
-};
-
-function _formatVersion(version): string {
-  return (
-    `${version.major}.${version.minor}.${version.patch}` +
-    // eslint-disable-next-line eqeqeq
-    (version.prerelease != undefined ? `-${version.prerelease}` : '')
-  );
-}