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SID shows instead of Username in Windows 10




I just found out that


i have a user name call S-1-5-21-557168193-5366160682-248833-1221


that S-1-5-21-557168193-5366160682-248833-1221 have all the permission of my computer.

and it seems like S-1-5-21-557168193-5366160682-248833-1221  This big number (SID) refers to the user may34

what i do not understand is that why suddenly window shows me SID over user name.


why does Windows 10  shows SID instead of Username on any file i have on Download.



Thank you! and sorry about my English!

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