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Thu, Mar 21, 2024 9:06 pm

Determining Excel's autosave value from the Windows registry

Microsoft Excel provides an autorecover feature that allows you to recover updates to spreadsheets or other files that were open in Excel even if changes were made since the last time the file was saved. Excel will automatically save files at a specified time interval so that if Excel crashes or the system crashes or loses power, you can recover the latest version of the file, or at least the file as it was the last time Excel automatically saved it. For the Office 365 version of Excel, you can find the autosave interval by clicking on File in Excel then selecting More, then Options, and then Save. The default value is 10 minutes but you can have Excel save more or less frequently.

Excel Save Options

You can also find the value by checking the Windows Registry, which you can view or edit by using the Registry Editor program that comes with Microsoft Windows. You can find the value by navigating to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel\Options and checking the value for AutoRecoverTime.

[ More Info ]

[/os/windows/registry] permanent link

Tue, Jan 28, 2020 10:16 pm

Determining the time a registry key was last updated

When I ran a scan of a Windows System with Spybot Search & Destroy 1.62, it reported it found a Windows registry key associated with GhostMail - it identified GhostMail as adware. To check the registry key, I typed regedit in the "Type here to search" field at the bottom of the screen and then selected the "Registry Editor" app when it appeared in the list of returned results (you can also open the application by typing regedit and hitting enter at a command prompt. I then navigated to the relevant key. I wanted to determine when the registry was created or at least when it was last modified. You can't see that information in the Windows Registry Editor, but you can create a text file that will contain that information by right-clicking on a key and choosing "Export" to generate a text file - select "Text Files (*.txt)" in the "Save as type" field, not the default value of "Registration Files (*.reg)." The text file will contain the key as well as the time it was last written to:

Key Name:HKEY_USERS\S-1-5-21-3084690208-3888753220-1328190817-1115\Software\Albert Yale
Class Name:<NO CLASS>
Last Write Time:8/16/2019 - 10:54 PM

In this case, the date on the key was months ago, so didn't explain recent problems on the user's PC and since Spybot - Search & Destroy didn't locate anything else, the registry key may have been a remnant of something removed many months ago.

[ More Info ]

[/os/windows/registry] permanent link

Fri, Mar 25, 2016 9:45 pm

Creating a registry entry to run a program at login

If you wish to have a program run whenever a user logs into the system, then you can add an entry to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run in the Windows Registry, assuming you are logged into the system as the user for which you wish to have the program run at logon at the time you add the entry to the registry, so that HKEY_CURRENT_USER (HKCU), which applies to the currently logged in user, applies to that user's account.

One way you can add a new entry in the registry for a program to run when the user logs in is to use the regedit program that comes with the Windows operating system and which is normally found in the C:\Windows directory.

[ More Info ]

[/os/windows/registry] permanent link

Sun, Jan 24, 2016 9:45 pm

Using reg query to determine the last registry key accessed

You can determine the last Windows Registry key accessed in regedit by issuing a reg query command from a command prompt. E.g., suppose I ran regedit and viewed HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run and then exited from regedit.

Regedit - Accessed HKCU Run

From a command line interface (CLI), i.e., a command prompt, I can issue the command reg query HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Regedit /v LastKey, which will show me the last key that was accessed while in regedit. If I reopen regedit, it will start with that key selected, i.e., it will open from the key selected when I exited from the program.

C:\>reg query HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Regedit /v LastKey

    LastKey    REG_SZ    Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run


Note: the command is querying a key in HKEY Current User (HKCU), so the results apply to the account from which the command is run. If you run the command from a different account on the system, you will get the LastKey value for that account.

[/os/windows/registry] permanent link

Fri, Jan 09, 2015 11:03 pm

Recovering information for the HKCU branch of the registry from a backup

Microsoft Windows stores information contained in the HKEY_CURRENT_USER branch of the registry, which is often abbreviated as HKCU, in the file NTUSER.DAT. That file is stored in the user's profile directory, which is usually C:\Windows\Username, where Username is the account name. The location can be checked by issuing the command echo %USERPROFILE% from a command prompt while logged into the account.

The file is a hidden and system file, so you would need to turn on the display of hidden and system files in the Windows Explorer to see it, but even then, if you are logged into the account for which you are trying to access NTUSER.DAT it will be locked from access. You can view the contents of the file for another account or the contents of a backup copy of NTUSER.DAT using the RegFileExport utility from NirSoft as explained in Recovering information for the HKCU branch of the registry from a backup.

[/os/windows/registry] permanent link

Sun, Mar 22, 2009 10:52 am

Determining Device Driver Locations Used During Setup

To determine where Microsoft Windows will look for device driver files during the Windows setup process, you need to examine the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion.

[ More Info ]

[/os/windows/registry/devicepath] permanent link

Sat, Apr 28, 2007 1:30 pm

Removing the Arrow from Windows Shortcuts

If you want to remove the arrow that appears on Windows shortcuts, you can do so by using the following procedure.
  1. Click on Start.
  2. Select Run.
  3. Type regedit
  4. Click on Ok.
  5. Navigate to HKEY_CLASSES_ROOT\lnkfile.
  6. On the right side of the window, right-click on IsShortcut and choose Delete.

Remember, you must be careful when editing the registry. Mistakes in editing registry entries can cause significant problems.

As an alternative to the above method, you can use this shortcut-arrow-removal.reg registry file, which will delete the IsShortcut key from the registry. Download the file (you can right-click on the link and choose "download", "save link target as", or whatever your browser ues to initiate a download) and then, once it is downloaded, double-click on the file on your system. When prompted "Are you sure you want to add the information in shortcut-arrow-removal.reg to the registry?", select "Yes". That action will result in the key being removed; the prompt about adding information is just the default message that appears whenever you click on a .reg file.


  1. Remove shortcut arrow from desktop icons
    Free PC Tech Support - Guides and FAQs

[/os/windows/registry] permanent link

Mon, Sep 25, 2006 11:35 pm

Saving and Restoring Windows File Associations

To be able to restore Windows file associations, you need to make a copy of two areas in the Windows registry: HKEY_CURRENT_USER\Software\Classes and HKEY_LOCAL_MACHINE\Software\Classes. Windows stores information on what application should be used to open a particular type of file, e.g. a file with a .jpg association in those two areas. If you have made a backup and some applications makes changes that you would like to reverse, you can use your backup files for those two branches of the registry to restore the file associations to what they were previously.

[ More Info ]

[/os/windows/registry] permanent link

Sat, Aug 13, 2005 1:06 pm

Registry P3P History Key

While troubleshooting an Internet access problem on a system, I noticed a lot of entries for dubious sites in the registry under HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\P3P\History\. There were a lot of keys for domain names I know are associated with adware/spyware, such as,, and There were a lot of other dubious sounding domain names, such as,, and When I checked the values of the keys, I noticed they were all set as follows:

(Default)REG_DWORD0x00000005 (5)

At Microsoft's WinInet Registry settings webpage, I found the following:

Per Site Cookie Handling

To handle site-by-site cookies, per-domain cookie decisions are stored under the HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\P3P\History\<domain> key. The domains are added to the registry by WinInet when the user adds sites by using the Per Site Privacy Actions dialog box.

The default value of the <domain> key stores the decision value. The following table shows the possible values.

REG_DWORD: 1 (COOKIE_STATE_ACCEPT) Accept all cookies from this site.
REG_DWORD: 5 (COOKIE_STATE_REJECT) Reject all cookies from this site.

So a value of five in the key will block cookies from a site listed with that value. The values were probably placed there by one of the antispyware programs I previously installed on the system.

Internet Explorer 6 apparently checks the P3P keys to determine whether to allow a site to place a cookie on the system as described in IE6 and cookies. P3P stands for Platform for Privacy Preferences.


  1. WinInet Registry Settings
  2. IE6 and cookies
  3. P3P Public Overview

[/os/windows/registry] permanent link

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