Member Avatar for MeSam0804

how can I read or copy such files , so that I can use them or know what they include ?
I know it's because of that they are protected and not shared while use ,
but I want to use these data
maybe it can be done bysome kind of programmings , please tell me

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Short answer: ntuser.dat is the per‑user registry hive (mapped to HKEY_CURRENT_USER) and Windows keeps that hive loaded while the user is signed in, so the file is normally locked and can’t be copied by Explorer. As suggested, booting a different OS (Linux live USB, WinPE) will let you read the on‑disk file; however that copy is the on‑disk state at that moment (it may miss very recent in‑memory or transaction‑log activity). (learn.microsoft.com)

Practical options

  • Use a VSS (Volume Shadow Copy) snapshot to get a consistent point‑in‑time copy while Windows is running. DiskShadow (or other VSS tools) can create and expose a shadow copy you can copy from without interrupting users. Example DiskShadow script:

      # diskshadow script (run as admin)
  set context persistent nowriters
  add volume C: alias systemvol
  create
  expose %systemvol% P:

    Then copy P:\Users\<user>\NTUSER.DAT. See DiskShadow / VSS docs for details and permissions. (learn.microsoft.com)

  • Boot external media and copy the file offline. A Linux Live USB with an NTFS driver (ntfs3/ntfs‑3g) can mount the Windows volume read‑only and let you copy NTUSER.DAT safely; likewise booting WinPE/WinRE lets you open RegEdit and use File → Load Hive to inspect a copied hive. To mount and inspect offline, you can also use reg load / reg unload from an elevated command prompt. Example:

      reg load HKLM\OfflineUser C:\Users\Alice\NTUSER.DAT
  reg unload HKLM\OfflineUser

    (Always unload to save/close.) (system-rescue.org)

Quick troubleshooting tips

  • If Explorer or a service is holding the file, identify it with Sysinternals Process Explorer (Find → Find Handle or DLL) or the Handle utility (handle.exe "C:\Users\<user>\NTUSER.DAT"). Don’t randomly kill system processes; closing handles can destabilize the system. If you only need to read keys, copy the file and load the copy offline rather than editing the live hive. (learn.microsoft.com)

Cautions: never edit the live NTUSER.DAT while the account is logged on (corruption and profile errors can result). Back up the hive before making changes and prefer an offline or VSS snapshot workflow for inspection or recovery. (learn.microsoft.com)

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Member Avatar for flagstar

What kind of files you want to access? Did you try to check it under 'Task Manager' and see if it is indeed running?

Member Avatar for MeSam0804

well , I mean mostly system files that are not shared of opening like ntuser.dat in user files

Member Avatar for flagstar

That's definitely can't be read or copy/paste when operate under Windows. Windows need it to read files inside those folders or it will have problem reading it and cause unnecessary BSOD or windows error.

The only way to read or copy it is by using non-Windows OS like Linux, Mac, Ubuntu etc. They can bypass the file protection put by windows can do whatever you like to the files.

for non-windows OS, you can use live-cd version so you can run those OS without installing to your computer and copy those files under same OS...

Member Avatar for MeSam0804

then you mean it will have the same data it has when windows is running ?
anyway ,thanks for your reply
I think I will do that :)

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