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Whats user S-1-5-21-343818398-1957994488-839522115-1000?

KAbbott asked

If I right click on of my folders with the wwwroot directory on my iis server theres a user called:

The icon is also whited with a question mark on it.

Does anyone know what this means?
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This is the SID of a user that Windows can't resolve to a name, probably because he does not exist anymore or that he is member of a domain or other machine and that you're machine can't resolve the name to a name so it displays the SID instead.


What do you think I should do with this user?

I am not on a network or anything, is it safe to delete and will it cause me any problems?
It shouldn't cause any problems...

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