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Date:	Thu, 2 Jun 2022 09:14:40 -0600
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Subject:	Re: Permissions issues after installing Windows 10
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On Thu, Jun 2, 2022 at 6:44 AM Brent Epp wrote:

In the [Security] tab for these files or directories, under "Group or
> user names", it lists the owner as "Account Unknown(S-...)".  In some
> cases, these files are completely inaccessible and I can't even take
> ownership or change the permissions.  I have to either restore them from
> a backup or boot to a Linux environment to access them.
>

Windows displays "Account Unknown" (with a SID) in the ACL when it can't
resolve the SID reference.

There can be a number of reasons for this. One common reason is that the
SID belongs to a domain account and the domain is not accessible. Another
is that the SID belongs to a local account on a different computer (e.g., a
removable disk is moved between computers and local accounts are in the
ACL). Well-known SIDs (e.g., S-1-5-32-544 for the local Administrators
group, etc.) should resolve from any computer.

Bill

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