How do You Lock a File in Windows to Block Deletion or Overwriting?
 

While there are plenty of third-party programs to accomplish a task, sometimes you just want to use a built-in method to do the same thing. Today’s SuperUser Q&A post helps a reader find an awesome built-in solution to keep his files from being deleted or overwritten.

http://www.howtogeek.com/206875/how-...r-overwriting/