diff --git a/editor/editor_file_system.cpp b/editor/editor_file_system.cpp
index 491c4a231ea..e6cc7efad70 100644
--- a/editor/editor_file_system.cpp
+++ b/editor/editor_file_system.cpp
@@ -1498,6 +1498,10 @@ void EditorFileSystem::update_file(const String &p_file) {
 	_queue_update_script_classes();
 }
 
+Set<String> EditorFileSystem::get_valid_extensions() const {
+	return valid_extensions;
+}
+
 Error EditorFileSystem::_reimport_group(const String &p_group_file, const Vector<String> &p_files) {
 	String importer_name;
 
diff --git a/editor/editor_file_system.h b/editor/editor_file_system.h
index 5a8e0056d1f..660a1afee31 100644
--- a/editor/editor_file_system.h
+++ b/editor/editor_file_system.h
@@ -262,6 +262,7 @@ public:
 	void scan_changes();
 	void get_changed_sources(List<String> *r_changed);
 	void update_file(const String &p_file);
+	Set<String> get_valid_extensions() const;
 
 	EditorFileSystemDirectory *get_filesystem_path(const String &p_path);
 	String get_file_type(const String &p_file) const;
diff --git a/editor/filesystem_dock.cpp b/editor/filesystem_dock.cpp
index 8d75b0275ea..03da04670cc 100644
--- a/editor/filesystem_dock.cpp
+++ b/editor/filesystem_dock.cpp
@@ -1436,12 +1436,18 @@ void FileSystemDock::_folder_removed(String p_folder) {
 
 void FileSystemDock::_rename_operation_confirm() {
 	String new_name = rename_dialog_text->get_text().strip_edges();
+	String old_name = tree->get_selected()->get_text(0);
 	if (new_name.length() == 0) {
 		EditorNode::get_singleton()->show_warning(TTR("No name provided."));
 		return;
 	} else if (new_name.find("/") != -1 || new_name.find("\\") != -1 || new_name.find(":") != -1) {
 		EditorNode::get_singleton()->show_warning(TTR("Name contains invalid characters."));
 		return;
+	} else if (to_rename.is_file && old_name.get_extension() != new_name.get_extension()) {
+		if (!EditorFileSystem::get_singleton()->get_valid_extensions().find(new_name.get_extension())) {
+			EditorNode::get_singleton()->show_warning(TTR("This file extension is not recognized by the editor.\nIf you want to rename it anyway, use your operating system's file manager.\nAfter renaming to an unknown extension, the file won't be shown in the editor anymore."));
+			return;
+		}
 	}
 
 	String old_path = to_rename.path.ends_with("/") ? to_rename.path.substr(0, to_rename.path.length() - 1) : to_rename.path;