Cannot open the document because the file is locked. Use the 'Properties' command in Windows Explorer to open the file.

I am a member of the Administrators group on my computer.  I have a folder full of files and other folders that I denied access for administrator users.  Not sure when it appeared that I had gone for the holidays, but now I am unable to open the files located in this folder.  I can delete, move, and rename at will, but can not open.  I tried all the resets of permissions I can think as well as read all knowledge base articles I can find but still not get these files to open.

I've recently updated MS Security Essentials, do not know if this has a any correlation.

At one point, I saw the certificate and it ranked as not approved.  How would this change?  Would this impact my ability to open files yet again let me move, delete and rename?  If so, how can I solve?

I restore to a restore point previous and not yet open - also received an error message telling me MS Security Essentials would not work properly.  So I undid the restore.

Thank you in advance for any input.  PatrixUSA

In fact, it starts to make a lot of sense today.  The files that you have problems with have been encrypted with EFS.  EFS is closely related to the NTFS file system.  As long as you move files encrypted in the same Volume, it is not a problem, because a move is an operation of directory and the directories themselves are not encrypted (only the files that are there).  Whenever you move an encrypted volume to another file, the file must be decrypted, transferred to the other volume, then re-encrypted to destination.  Thus, the destination volume must be a NTFS file system to keep encrypted files.  If the destination is not a NTFS volume, then the copy would result in a file that is not encrypted at the destination and you will be prompted as to whether or not to allow the operation.  In all cases, a copy of volume-volume requires decryption of the file and any operation that requires a decryption error of access for you - more your inability to open a file normally indicates that you no longer control the certificate to decrypt the file.

Backups are another matter.  If you are using Microsoft Backup utility (NTbackup), so he recognizes the encrypted file attribute and it backs up as - is without decoding.  Other 3rd third-party backup programs may not recognize the encrypted files and simply read and write to the backup media.  When this happens, the files are automatically decrypted to read (assuming the user certificates requires archiving) and writings of backup to a file unencrypted.  This would explain why you can retrieve an archive and it is not encrypted.  DVD and optical bands do not use NTFS, so a decryption of the original file is required to save in these environments.

The private part of your (needed for decryption of files) EFS encryption certificate itself is stored encrypted on your computer.  To decrypt, Windows uses your SecureID, password, and other things of which I'm unaware.  If your password is not reset in the normal way (i.e. by entering your current password and your new password) such as an administrator, then your certificate is not re-encrypted to your new password and your access lose him and with him, access to your EFS files.  Other forms of corruption can cause you to lose your certificate, but it seems that at some point you have lost access to your certificate and therefore cannot access files that have been encrypted under this certificate.

New files that you write in a directory that has been activated with EFS will notice that you have a valid certificate and then automatically generate a new certificate that will be used to encrypt files from right now.  That's why the new files that you add to this directory appear to work well.  The only real mystery what I can't explain is the reason why a system restore to a time where it wasn't a problem does not allow you to restore access.

If you want some heavy reading, try this:

"Encrypting file system in Windows XP and Windows Server 2003"
  <>http://TechNet.Microsoft.com/en-us/library/bb457065.aspx >

Personally, I'm not fan of the EFS because of problems like this.  I prefer the freewareTruecrypt which is just as safe, but I myself manage keys (in the form of password) instead of Windows.  Also, it hides the names of files and can be used safely on a connection in network and backup from windows volume is encrypted little matter how they are done.  I have not lost all data encrypted in more than a decade.

HTH,
JW

Tags: Windows

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