diff --git a/api/src/main/java/fr/atlasworld/network/api/file/FileManager.java b/api/src/main/java/fr/atlasworld/network/api/file/FileManager.java
index 8e9d5f0..1c03e6f 100644
--- a/api/src/main/java/fr/atlasworld/network/api/file/FileManager.java
+++ b/api/src/main/java/fr/atlasworld/network/api/file/FileManager.java
@@ -29,6 +29,22 @@ public interface FileManager {
      */
     void registerModuleFile(Module module, File file);
 
+    /**
+     * Checks if a file is registered.
+     * @see
+     * @param file
+     * @return
+     */
+    boolean isFileRegistered(File file);
+
+    /**
+     * Gets the module registered as the owner of the specified file.
+     *
+     * @param file file to check.
+     * @return owner module of the file.
+     */
+    Module whoIsOwner(File file);
+
     /**
      * Register a configuration file for a module.
      *
diff --git a/api/src/main/java/fr/atlasworld/network/api/file/FileOwner.java b/api/src/main/java/fr/atlasworld/network/api/file/FileOwner.java
new file mode 100644
index 0000000..368f2bc
--- /dev/null
+++ b/api/src/main/java/fr/atlasworld/network/api/file/FileOwner.java
@@ -0,0 +1,27 @@
+package fr.atlasworld.network.api.file;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Member of AtlasNetworks file api, This is not a file system owner!
+ * <p>
+ * FileOwner are used by the cleanup system to prevent deletion of used files or directories.
+ * File can be registered by a module when its activating.
+ * @see fr.atlasworld.network.api.file.FileManager
+ */
+public interface FileOwner {
+
+    /**
+     * Unique ID of the owner, your module ID is being used here.
+     */
+    @NotNull
+    String ownerId();
+
+    /**
+     * Checks if this owner allows other owners to read/write to file registered by him by default.
+     * AtlasNetwork Core System will always have access to the owner's files.
+     */
+    boolean allowsExternalOwnerUsage();
+
+
+}
diff --git a/api/src/main/java/fr/atlasworld/network/api/file/RegisteredFile.java b/api/src/main/java/fr/atlasworld/network/api/file/RegisteredFile.java
new file mode 100644
index 0000000..66b81a5
--- /dev/null
+++ b/api/src/main/java/fr/atlasworld/network/api/file/RegisteredFile.java
@@ -0,0 +1,35 @@
+package fr.atlasworld.network.api.file;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.File;
+
+/**
+ * Registered File information.
+ */
+public interface RegisteredFile {
+
+    /**
+     * Retrieve the file owner.
+     * @return null if the file does not have an owner.
+     */
+    @Nullable
+    FileOwner getOwner();
+
+    /**
+     * Get the file.
+     */
+    @NotNull
+    File sourceFile();
+
+    /**
+     * Checks if reading the file is allowed.
+     */
+    boolean readAllowed();
+
+    /**
+     * Checks if writing to the file is allowed.
+     */
+    boolean writeAllowed();
+}
diff --git a/api/src/main/java/fr/atlasworld/network/api/file/configuration/ConfigurationSchema.java b/api/src/main/java/fr/atlasworld/network/api/file/configuration/ConfigurationSchema.java
index f8e842e..71fd4a6 100644
--- a/api/src/main/java/fr/atlasworld/network/api/file/configuration/ConfigurationSchema.java
+++ b/api/src/main/java/fr/atlasworld/network/api/file/configuration/ConfigurationSchema.java
@@ -2,6 +2,8 @@
 
 import com.google.gson.Gson;
 import com.google.gson.JsonElement;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * Configuration Schema, sets all the required information for the configuration to work properly.
@@ -13,6 +15,7 @@ public interface ConfigurationSchema<T extends ConfigurationFile> {
      * Defines the configuration file path inside the {@code configurations/} directory.
      * @return configuration file path.
      */
+    @NotNull
     String filepath();
 
     /**
@@ -25,6 +28,7 @@ public interface ConfigurationSchema<T extends ConfigurationFile> {
      * Get the default configuration.
      * @return default configuration.
      */
+    @NotNull
     T defaultConfiguration();
 
     /**
@@ -32,6 +36,7 @@ public interface ConfigurationSchema<T extends ConfigurationFile> {
      * Used internally to parse the file.
      * @return configuration file class.
      */
+    @NotNull
     Class<T> configurationClass();
 
     /**
@@ -49,5 +54,6 @@ public interface ConfigurationSchema<T extends ConfigurationFile> {
      *
      * @return the updated configuration file
      */
+    @Nullable
     T updateConfiguration(JsonElement json, Gson gson, int currentVersion);
 }
diff --git a/api/src/test/java/fr/atlasworld/network/api/test/configuration/TestConfigurationSchema.java b/api/src/test/java/fr/atlasworld/network/api/test/configuration/TestConfigurationSchema.java
index ba69b72..7e2e66b 100644
--- a/api/src/test/java/fr/atlasworld/network/api/test/configuration/TestConfigurationSchema.java
+++ b/api/src/test/java/fr/atlasworld/network/api/test/configuration/TestConfigurationSchema.java
@@ -3,10 +3,11 @@
 import com.google.gson.Gson;
 import com.google.gson.JsonElement;
 import fr.atlasworld.network.api.file.configuration.ConfigurationSchema;
+import org.jetbrains.annotations.NotNull;
 
 public class TestConfigurationSchema implements ConfigurationSchema<TestConfiguration> {
     @Override
-    public String filepath() {
+    public @NotNull String filepath() {
         return "test_dir/test";
     }
 
@@ -16,12 +17,12 @@ public int configurationVersion() {
     }
 
     @Override
-    public TestConfiguration defaultConfiguration() {
+    public @NotNull TestConfiguration defaultConfiguration() {
         return new TestConfiguration(true);
     }
 
     @Override
-    public Class<TestConfiguration> configurationClass() {
+    public @NotNull Class<TestConfiguration> configurationClass() {
         return TestConfiguration.class;
     }
 
diff --git a/src/main/java/fr/atlasworld/network/core/AtlasNetwork.java b/src/main/java/fr/atlasworld/network/core/AtlasNetwork.java
index b06e9fe..d223b6a 100644
--- a/src/main/java/fr/atlasworld/network/core/AtlasNetwork.java
+++ b/src/main/java/fr/atlasworld/network/core/AtlasNetwork.java
@@ -1,14 +1,25 @@
 package fr.atlasworld.network.core;
 
+import fr.atlasworld.network.api.AtlasNetworkServer;
+import fr.atlasworld.network.api.file.FileManager;
 import fr.atlasworld.network.boot.LaunchArgs;
 import fr.atlasworld.network.core.module.ModuleManager;
 
-public class AtlasNetwork {
+public class AtlasNetwork implements AtlasNetworkServer {
+    private final FileManager fileManager;
+
     private AtlasNetwork(final LaunchArgs args) {
         ModuleManager moduleManager = ModuleManager.init(args);
         moduleManager.load();
 
         //Module Manager -> Load Modules -> Done Later once AtlasNetwork is initialized
         moduleManager.initialize();
+
+
+    }
+
+    @Override
+    public FileManager getFileManager() {
+        return
     }
 }
diff --git a/src/main/java/fr/atlasworld/network/core/file/SystemFileManager.java b/src/main/java/fr/atlasworld/network/core/file/SystemFileManager.java
new file mode 100644
index 0000000..17266db
--- /dev/null
+++ b/src/main/java/fr/atlasworld/network/core/file/SystemFileManager.java
@@ -0,0 +1,52 @@
+package fr.atlasworld.network.core.file;
+
+import fr.atlasworld.network.api.file.FileManager;
+import fr.atlasworld.network.api.file.configuration.ConfigurationFile;
+import fr.atlasworld.network.api.file.configuration.ConfigurationReader;
+import fr.atlasworld.network.api.file.configuration.ConfigurationSchema;
+import fr.atlasworld.network.api.file.exception.unchecked.FileRegistrationException;
+import fr.atlasworld.network.api.module.Module;
+import fr.atlasworld.network.boot.LaunchArgs;
+
+import java.io.File;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class SystemFileManager implements FileManager {
+    private final Map<File, Module> registeredFilesMap = new ConcurrentHashMap<>();
+
+    @Override
+    public void registerModuleFile(Module module, File file) throws FileRegistrationException {
+        this.registeredFilesMap.containsKey(file)
+    }
+
+    @Override
+    public <T extends ConfigurationFile> ConfigurationReader<T> registerConfiguration(Module module, ConfigurationSchema<T> schema) throws FileRegistrationException {
+        String filename = schema.filepath().endsWith(".json") ? schema.filepath() : schema.filepath() + ".json";
+        File configurationFile = SystemFileManager.getConfigurationFile(filename);
+
+        this.registerModuleFile(module, configurationFile); // Try to register the file
+
+
+    }
+
+    // Static fields
+    public static final File WORKING_DIRECTORY = new File(System.getProperty("user.dir"));
+
+    public static File getDataDirectory() {
+        return LaunchArgs.getArguments().getDataDirectory();
+    }
+
+    public static File getModuleDirectory() {
+        return LaunchArgs.getArguments().getModuleDirectory();
+    }
+
+    public static File getConfigurationDirectory() {
+        return LaunchArgs.getArguments().getConfigurationDirectory();
+    }
+
+    public static File getConfigurationFile(String name) {
+        return new File(getConfigurationDirectory(), name);
+    }
+}
diff --git a/src/main/java/fr/atlasworld/network/core/module/lifecycle/ModuleActivateContextImpl.java b/src/main/java/fr/atlasworld/network/core/module/lifecycle/ModuleActivateContextImpl.java
index e26a371..75d61df 100644
--- a/src/main/java/fr/atlasworld/network/core/module/lifecycle/ModuleActivateContextImpl.java
+++ b/src/main/java/fr/atlasworld/network/core/module/lifecycle/ModuleActivateContextImpl.java
@@ -1,6 +1,17 @@
 package fr.atlasworld.network.core.module.lifecycle;
 
+import fr.atlasworld.network.api.AtlasNetworkServer;
 import fr.atlasworld.network.api.module.lifecycle.ModuleActivationContext;
 
 public class ModuleActivateContextImpl implements ModuleActivationContext {
+    private final AtlasNetworkServer server;
+
+    public ModuleActivateContextImpl(AtlasNetworkServer server) {
+        this.server = server;
+    }
+
+    @Override
+    public AtlasNetworkServer getServer() {
+        return this.server;
+    }
 }
diff --git a/src/main/java/fr/atlasworld/network/core/util/FileManager.java b/src/main/java/fr/atlasworld/network/core/util/FileManager.java
index 0a1219b..a164c51 100644
--- a/src/main/java/fr/atlasworld/network/core/util/FileManager.java
+++ b/src/main/java/fr/atlasworld/network/core/util/FileManager.java
@@ -5,17 +5,5 @@
 import java.io.File;
 
 public class FileManager {
-    public static final File WORKING_DIRECTORY = new File(System.getProperty("user.dir"));
 
-    public static File getDataDirectory() {
-        return LaunchArgs.getArguments().getDataDirectory();
-    }
-
-    public static File getModuleDirectory() {
-        return LaunchArgs.getArguments().getModuleDirectory();
-    }
-
-    public static File getConfigurationDirectory() {
-        return LaunchArgs.getArguments().getConfigurationDirectory();
-    }
 }