First of all, I am a novice, the following methods such as there is not correct, hope that the bosses can point to, Sometimes we delete files will be displayed when the file is opened in the other file, if you don't want to find other just want to delete this file, you can try this way, I (win10) 1. Right-click the file and open the properties
2. Click on the security 3. Click advanced below the permissions 4. Click on the disable inheritance 5. Click "delete has inherited from the object permissions" Then you can delete the file