diff --git a/AdvancedCppV2/Presentation/exercises/files/main.cpp b/AdvancedCppV2/Presentation/exercises/files/main.cpp
index 52702a3..833c662 100644
--- a/AdvancedCppV2/Presentation/exercises/files/main.cpp
+++ b/AdvancedCppV2/Presentation/exercises/files/main.cpp
@@ -30,6 +30,18 @@ void printPermissionsForDir() {
 }
 
 void changePermissions() {
+    for (const auto& entry : fs::directory_iterator(fs::current_path().string() + "/project")) {
+        if (fs::is_regular_file(entry.path())) {
+            fs::perms p = fs::perms::none;
+            using per = fs::perms;
+            if(entry.path().extension() == ".exe"){
+                p = per::owner_all | per::group_read | per::group_write | per::others_read | per::others_write;
+            } else if(entry.path().extension() == ".cpp" || entry.path().extension() == ".hpp"){
+                p = per::owner_read | per::owner_write | per::group_read | per::others_read;
+            }
+            fs::permissions(entry.path(), p);
+        }
+    }
 }
 
 int main() {
@@ -49,4 +61,4 @@ int main() {
     std::cout << "files which were longest unmodified: \n";
     // Print it here
     */
-}
\ No newline at end of file
+}