diff --git a/analytics/src/analytics_desktop.cc b/analytics/src/analytics_desktop.cc
new file mode 100644
index 000000000..636ecb8e2
--- /dev/null
+++ b/analytics/src/analytics_desktop.cc
@@ -0,0 +1,373 @@
+// Copyright 2025 Google LLC
+//
+// 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.
+
+#include "analytics/src/windows/analytics_windows.h"
+#include "app/src/include/firebase/app.h"
+#include "analytics/src/include/firebase/analytics.h"
+#include "analytics/src/common/analytics_common.h"
+#include "common/src/include/firebase/variant.h"
+#include "app/src/include/firebase/future.h"
+#include "app/src/include/firebase/log.h"
+#include "app/src/future_manager.h" // For FutureData
+
+#include <vector>
+#include <string>
+#include <map>
+
+namespace firebase {
+namespace analytics {
+
+// Future data for analytics.
+// This is initialized in `Initialize()` and cleaned up in `Terminate()`.
+static FutureData* g_future_data = nullptr;
+
+// Initializes the Analytics desktop API.
+// This function must be called before any other Analytics methods.
+void Initialize(const App& app) {
+  // The 'app' parameter is not directly used by the underlying Google Analytics C API
+  // for Windows for global initialization. It's included for API consistency
+  // with other Firebase platforms.
+  (void)app;
+
+  if (g_future_data) {
+    LogWarning("Analytics: Initialize() called when already initialized.");
+  } else {
+    g_future_data = new FutureData(internal::kAnalyticsFnCount);
+  }
+}
+
+// Terminates the Analytics desktop API.
+// Call this function when Analytics is no longer needed to free up resources.
+void Terminate() {
+  if (g_future_data) {
+    delete g_future_data;
+    g_future_data = nullptr;
+  } else {
+    LogWarning("Analytics: Terminate() called when not initialized or already terminated.");
+  }
+}
+
+static void ConvertParametersToGAParams(
+    const Parameter* parameters,
+    size_t number_of_parameters,
+    GoogleAnalytics_EventParameters* c_event_params) {
+  if (!parameters || number_of_parameters == 0 || !c_event_params) {
+    return;
+  }
+
+  for (size_t i = 0; i < number_of_parameters; ++i) {
+    const Parameter& param = parameters[i];
+    if (param.name == nullptr || param.name[0] == '\0') {
+      LogError("Analytics: Parameter name cannot be null or empty.");
+      continue;
+    }
+
+    if (param.value.is_int64()) {
+      GoogleAnalytics_EventParameters_InsertInt(c_event_params, param.name,
+                                                param.value.int64_value());
+    } else if (param.value.is_double()) {
+      GoogleAnalytics_EventParameters_InsertDouble(c_event_params, param.name,
+                                                   param.value.double_value());
+    } else if (param.value.is_string()) {
+      GoogleAnalytics_EventParameters_InsertString(
+          c_event_params, param.name, param.value.string_value());
+    } else if (param.value.is_vector()) {
+      // Vector types for top-level event parameters are not supported on Desktop.
+      // Only specific complex types (like a map processed into an ItemVector) are handled.
+      LogError("Analytics: Parameter '%s' has type Vector, which is unsupported for event parameters on Desktop. Skipping.", param.name);
+      continue; // Skip this parameter
+    } else if (param.value.is_map()) {
+      // This block handles parameters that are maps.
+      // Each key-value pair from the input map is converted into a distinct GoogleAnalytics_Item.
+      // In each such GoogleAnalytics_Item, the original key from the map is used directly
+      // as the property key, and the original value (which must be a primitive)
+      // is set as the property's value.
+      // All these GoogleAnalytics_Items are then bundled into a single
+      // GoogleAnalytics_ItemVector, which is associated with the original parameter's name.
+      const std::map<std::string, firebase::Variant>& user_map =
+          param.value.map_value();
+      if (user_map.empty()) {
+        LogWarning("Analytics: Parameter '%s' is an empty map. Skipping.", param.name);
+        continue; // Skip this parameter
+      }
+
+      GoogleAnalytics_ItemVector* c_item_vector =
+          GoogleAnalytics_ItemVector_Create();
+      if (!c_item_vector) {
+        LogError("Analytics: Failed to create ItemVector for map parameter '%s'.", param.name);
+        continue; // Skip this parameter
+      }
+
+      bool item_vector_populated = false;
+      for (const auto& entry : user_map) {
+        const std::string& key_from_map = entry.first;
+        const firebase::Variant& value_from_map = entry.second;
+
+        GoogleAnalytics_Item* c_item = GoogleAnalytics_Item_Create();
+        if (!c_item) {
+          LogError("Analytics: Failed to create Item for key '%s' in map parameter '%s'.", key_from_map.c_str(), param.name);
+          continue; // Skip this key-value pair, try next one in map
+        }
+
+        bool successfully_set_property = false;
+        if (value_from_map.is_int64()) {
+          GoogleAnalytics_Item_InsertInt(c_item, key_from_map.c_str(), value_from_map.int64_value());
+          successfully_set_property = true;
+        } else if (value_from_map.is_double()) {
+          GoogleAnalytics_Item_InsertDouble(c_item, key_from_map.c_str(), value_from_map.double_value());
+          successfully_set_property = true;
+        } else if (value_from_map.is_string()) {
+          GoogleAnalytics_Item_InsertString(c_item, key_from_map.c_str(), value_from_map.string_value());
+          successfully_set_property = true;
+        } else {
+          LogWarning("Analytics: Value for key '%s' in map parameter '%s' has an unsupported Variant type. This key-value pair will be skipped.", key_from_map.c_str(), param.name);
+          // successfully_set_property remains false
+        }
+
+        if (successfully_set_property) {
+          GoogleAnalytics_ItemVector_InsertItem(c_item_vector, c_item);
+          // c_item is now owned by c_item_vector
+          item_vector_populated = true; // Mark that the vector has at least one item
+        } else {
+          // If no property was set (e.g., value type was unsupported), destroy the created c_item.
+          GoogleAnalytics_Item_Destroy(c_item);
+        }
+      }
+
+      if (item_vector_populated) {
+        GoogleAnalytics_EventParameters_InsertItemVector(
+            c_event_params, param.name, c_item_vector);
+        // c_item_vector is now owned by c_event_params
+      } else {
+        // If no items were successfully created and added (e.g., all values in map were unsupported types)
+        GoogleAnalytics_ItemVector_Destroy(c_item_vector);
+        LogWarning("Analytics: Map parameter '%s' resulted in an empty ItemVector; no valid key-value pairs found or all values had unsupported types. This map parameter was skipped.", param.name);
+      }
+    } else {
+      LogWarning("Analytics: Unsupported variant type for parameter '%s'.", param.name);
+    }
+  }
+}
+
+// Logs an event with the given name and parameters.
+void LogEvent(const char* name,
+              const Parameter* parameters,
+              size_t number_of_parameters) {
+  if (name == nullptr || name[0] == '\0') {
+    LogError("Analytics: Event name cannot be null or empty.");
+    return;
+  }
+
+  GoogleAnalytics_EventParameters* c_event_params = nullptr;
+  if (parameters != nullptr && number_of_parameters > 0) {
+    c_event_params = GoogleAnalytics_EventParameters_Create();
+    if (!c_event_params) {
+      LogError("Analytics: Failed to create event parameters map for event '%s'.", name);
+      return;
+    }
+    ConvertParametersToGAParams(parameters, number_of_parameters, c_event_params);
+  }
+
+  GoogleAnalytics_LogEvent(name, c_event_params);
+  // GoogleAnalytics_LogEvent is expected to handle the lifecycle of c_event_params if non-null.
+}
+
+// Sets a user property to the given value.
+//
+// Up to 25 user property names are supported. Once set, user property values
+// persist throughout the app lifecycle and across sessions.
+//
+// @param[in] name The name of the user property to set. Should contain 1 to 24
+// alphanumeric characters or underscores, and must start with an alphabetic
+// character. The "firebase_", "google_", and "ga_" prefixes are reserved and
+// should not be used for user property names. Must be UTF-8 encoded.
+// @param[in] value The value of the user property. Values can be up to 36
+// characters long. Setting the value to `nullptr` or an empty string will
+// clear the user property. Must be UTF-8 encoded if not nullptr.
+void SetUserProperty(const char* name, const char* property) {
+  if (name == nullptr || name[0] == '\0') {
+    LogError("Analytics: User property name cannot be null or empty.");
+    return;
+  }
+  // The C API GoogleAnalytics_SetUserProperty allows value to be nullptr to remove the property.
+  // If value is an empty string, it might also be treated as clearing by some backends,
+  // or it might be an invalid value. The C API doc says:
+  // "Setting the value to `nullptr` remove the user property."
+  // For consistency, we pass it as is.
+  GoogleAnalytics_SetUserProperty(name, property);
+}
+
+// Sets the user ID property.
+// This feature must be used in accordance with Google's Privacy Policy.
+//
+// @param[in] user_id The user ID associated with the user of this app on this
+// device. The user ID must be non-empty if not nullptr, and no more than 256
+// characters long, and UTF-8 encoded. Setting user_id to `nullptr` removes
+// the user ID.
+void SetUserId(const char* user_id) {
+  // The C API GoogleAnalytics_SetUserId allows user_id to be nullptr to clear the user ID.
+  // The C API documentation also mentions: "The user ID must be non-empty and
+  // no more than 256 characters long".
+  // We'll pass nullptr as is. If user_id is an empty string "", this might be
+  // an issue for the underlying C API or backend if it expects non-empty.
+  // However, the Firebase API typically allows passing "" to clear some fields,
+  // or it's treated as an invalid value. For SetUserId, `nullptr` is the standard
+  // clear mechanism. An empty string might be an invalid ID.
+  // For now, we are not adding extra validation for empty string beyond what C API does.
+  // Consider adding a check for empty string if Firebase spec requires it.
+  // e.g., if (user_id != nullptr && user_id[0] == '\0') { /* log error */ return; }
+  GoogleAnalytics_SetUserId(user_id);
+}
+
+// Sets whether analytics collection is enabled for this app on this device.
+// This setting is persisted across app sessions. By default it is enabled.
+//
+// @param[in] enabled A flag that enables or disables Analytics collection.
+void SetAnalyticsCollectionEnabled(bool enabled) {
+  GoogleAnalytics_SetAnalyticsCollectionEnabled(enabled);
+}
+
+// Clears all analytics data for this app from the device and resets the app
+// instance ID.
+void ResetAnalyticsData() {
+  GoogleAnalytics_ResetAnalyticsData();
+}
+
+// --- Stub Implementations for Unsupported Features ---
+
+void SetConsent(const std::map<ConsentType, ConsentStatus>& consent_settings) {
+  // Not supported by the Windows C API.
+  (void)consent_settings; // Mark as unused
+  LogWarning("Analytics: SetConsent() is not supported and has no effect on Desktop.");
+}
+
+void LogEvent(const char* name) {
+  LogEvent(name, nullptr, 0);
+}
+
+void LogEvent(const char* name, const char* parameter_name,
+              const char* parameter_value) {
+  if (parameter_name == nullptr) {
+    LogEvent(name, nullptr, 0);
+    return;
+  }
+  Parameter param(parameter_name, parameter_value);
+  LogEvent(name, &param, 1);
+}
+
+void LogEvent(const char* name, const char* parameter_name,
+              const double parameter_value) {
+  if (parameter_name == nullptr) {
+    LogEvent(name, nullptr, 0);
+    return;
+  }
+  Parameter param(parameter_name, parameter_value);
+  LogEvent(name, &param, 1);
+}
+
+void LogEvent(const char* name, const char* parameter_name,
+              const int64_t parameter_value) {
+  if (parameter_name == nullptr) {
+    LogEvent(name, nullptr, 0);
+    return;
+  }
+  Parameter param(parameter_name, parameter_value);
+  LogEvent(name, &param, 1);
+}
+
+void LogEvent(const char* name, const char* parameter_name,
+              const int parameter_value) {
+  if (parameter_name == nullptr) {
+    LogEvent(name, nullptr, 0);
+    return;
+  }
+  Parameter param(parameter_name, static_cast<int64_t>(parameter_value));
+  LogEvent(name, &param, 1);
+}
+
+void InitiateOnDeviceConversionMeasurementWithEmailAddress(
+    const char* email_address) {
+  (void)email_address;
+  LogWarning("Analytics: InitiateOnDeviceConversionMeasurementWithEmailAddress() is not supported and has no effect on Desktop.");
+}
+
+void InitiateOnDeviceConversionMeasurementWithPhoneNumber(
+    const char* phone_number) {
+  (void)phone_number;
+  LogWarning("Analytics: InitiateOnDeviceConversionMeasurementWithPhoneNumber() is not supported and has no effect on Desktop.");
+}
+
+void InitiateOnDeviceConversionMeasurementWithHashedEmailAddress(
+    std::vector<unsigned char> hashed_email_address) {
+  (void)hashed_email_address;
+  LogWarning("Analytics: InitiateOnDeviceConversionMeasurementWithHashedEmailAddress() is not supported and has no effect on Desktop.");
+}
+
+void InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber(
+    std::vector<unsigned char> hashed_phone_number) {
+  (void)hashed_phone_number;
+  LogWarning("Analytics: InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber() is not supported and has no effect on Desktop.");
+}
+
+void SetSessionTimeoutDuration(int64_t milliseconds) {
+  (void)milliseconds;
+  LogWarning("Analytics: SetSessionTimeoutDuration() is not supported and has no effect on Desktop.");
+}
+
+Future<std::string> GetAnalyticsInstanceId() {
+  LogWarning("Analytics: GetAnalyticsInstanceId() is not supported on Desktop.");
+  if (!g_future_data) {
+    LogError("Analytics: API not initialized; call Initialize() first.");
+    static firebase::Future<std::string> invalid_future; // Default invalid
+    if (!g_future_data) return invalid_future; // Or some other error future
+  }
+  const auto handle =
+      g_future_data->CreateFuture(internal::kAnalyticsFn_GetAnalyticsInstanceId, nullptr);
+  g_future_data->CompleteFuture(handle, 0 /* error_code */, nullptr /* error_message_string */);
+  return g_future_data->GetFuture<std::string>(handle);
+}
+
+Future<std::string> GetAnalyticsInstanceIdLastResult() {
+  if (!g_future_data) {
+    LogError("Analytics: API not initialized; call Initialize() first.");
+    static firebase::Future<std::string> invalid_future;
+    return invalid_future;
+  }
+  return g_future_data->LastResult<std::string>(internal::kAnalyticsFn_GetAnalyticsInstanceId);
+}
+
+Future<int64_t> GetSessionId() {
+  LogWarning("Analytics: GetSessionId() is not supported on Desktop.");
+  if (!g_future_data) {
+    LogError("Analytics: API not initialized; call Initialize() first.");
+    static firebase::Future<int64_t> invalid_future;
+    return invalid_future;
+  }
+  const auto handle =
+      g_future_data->CreateFuture(internal::kAnalyticsFn_GetSessionId, nullptr);
+  g_future_data->CompleteFuture(handle, 0 /* error_code */, nullptr /* error_message_string */);
+  return g_future_data->GetFuture<int64_t>(handle);
+}
+
+Future<int64_t> GetSessionIdLastResult() {
+  if (!g_future_data) {
+    LogError("Analytics: API not initialized; call Initialize() first.");
+    static firebase::Future<int64_t> invalid_future;
+    return invalid_future;
+  }
+  return g_future_data->LastResult<int64_t>(internal::kAnalyticsFn_GetSessionId);
+}
+
+}  // namespace analytics
+}  // namespace firebase