well first you will have to make batch file with extension .bat and type this: " ren xxxx xxxx.{101193C0-0BFE-11D0-AF91-00AA00B67A42} " without "" replace the xxxxx with the folder's name you want to lock. if you want to unlock it make new batch file and type : " ren xxxxxxx.{101193C0-0BFE-11D0-AF91-00AA00B67A42} xxxxxxxx " also without "" and replace the xxxxx with the folder's name you want to unlock. it works btw don't worry the folder will look normal , no special icon or something the user wont know it's locked , but he can't access into it