Folder Properties - Group or UserName

I am trying to standardize the Folder Share Permissions for Users.
Reviewing the NTFS Security Tab I see these long series of numbers on some of the Folders I am trying to clean up.
Ex - ?S-1-5-21-205322222-90142563-22 and on and on

What causes this on some folder permissions and is it ok to simply delete? Is there a way to reference this to see what it is?
I assume it is a SID of sort.
Tim OBrienSystems EngineerAsked:
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Tim EdwardsIT Team Lead - Unified Communications & CollaborationCommented:
Most cases these were users that had direct access to the folder, the account was probably deleted but because of applying permissions in this manner most people never go  back and clean up the folder/file permission resulting in only the SID being displayed.

Depending on the version of your domain it can use some tools to go back into the recycling bin to match the user with the SID, the easiest would just delete them but make sure that it not a synchronization issue between your file server and AD that is causing a delay in the actual name being resolved prior to removing.

For this above reason is why I prefer to use AD Security Groups to manage my file permissions,, I have had to clean up my file servers which takes a lot of time, planning but once completed simplifies it over all

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Tim OBrienSystems EngineerAuthor Commented:
Thanks, appreciate the info.
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