How to delete file unknown account under Windows10 system

How to delete the file unknown account under Windows10 system
1. Open the file attribute. Here, take QQ as an example, find [security] and click, the arrow in the figure has been pointed out;

2, enter the [security] interface us I will find an unknown account;

3. At first I thought this can be deleted according to the normal method, so I click [Edit];

4, enter the account editing interface, select unknown Account, click delete, as indicated by the arrow;

5, after clicking delete, a warning pops up, prompting me to delete the object, must prevent the object from inheriting permissions, click OK;

6, but I was wrong, can not be deleted according to the conventional method, so I decided to cancel the inheritance rights of this account to the parent class, click [Advanced], the arrow in the figure has been pointed out;

7, enter the advanced interface, click [Change Permissions 】, as indicated by the arrow;

8, select the unknown user, and then select [disable inheritance], as indicated by the arrow;

9, a blocking inheritance prompt box will pop up , will prompt you to take what action, click on the first one will Inherited permissions are converted to display permissions for this object];

10, after clicking, we will find that the original [disabled inheritance] has become [enable inheritance];

11, click In the lower right corner of [Application] and [OK], the arrow in the figure has been marked;

12, after clicking, we return to the original security interface, click [Delete] to delete this inexplicable account; Br>
13, then we look at it, it turned out to be five accounts, now it is 4 accounts, the inexplicable account was successfully deleted by us.