Registry Hkcr

[Totaly Pavlina]

Hypotheticallymultiple providers with the same name could be registered, in which case you can prefix the name with the implementing module name for disambiguation; in the case of the registry provider, this module-qualified prefix is Microsoft.PowerShell.Core\Registry::[1] However, it's fair to assume that no third-party providers will choose a name that conflicts with the providers that ship with PowerShell, so Registry:: (or registry::, case doesn't matter), should do.

[1] Note that the Core part of the name does not refer to PowerShell Core (now renamed to PowerShell 7), the open-source, cross-platform PowerShell edition that succeeded Windows PowerShell; it simply denotes a module that is at the core of either edition.

Editing the registry is completely safe if you know what you're doing, but carelessness can lead to serious problems. Learn how to add, change, and delete registry keys and values for an introduction.

Due to the complexity of how HKEY_CLASSES_ROOT keys are set up, we absolutely do not recommend that you change default file associations from within the registry. Instead, see How to Change File Associations in Windows for instructions on doing this from within your normal Windows interface.

The HKEY_CLASSES_ROOT (HKCR) key contains file name extension associations and COM class registration information such as ProgIDs, CLSIDs, and IIDs. It is primarily intended for compatibility with the registry in 16-bit Windows.

Class registration and file name extension information is stored under both the HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER keys. The HKEY_LOCAL_MACHINE\Software\Classes key contains default settings that can apply to all users on the local computer. The HKEY_CURRENT_USER\Software\Classes key contains settings that apply only to the interactive user. The HKEY_CLASSES_ROOT key provides a view of the registry that merges the information from these two sources. HKEY_CLASSES_ROOT also provides this merged view for applications designed for previous versions of Windows.

The user-specific settings have priority over the default settings. For example, the default setting might specify a particular application to handle .doc files. But a user can override this setting by specifying a different application in the registry.

Registry functions such as RegOpenKeyEx or RegQueryValueEx allow you to specify the HKEY_CLASSES_ROOT key. When you call these functions from a process running in the interactive user account, the system merges the default settings in HKEY_LOCAL_MACHINE\Software\Classes with the interactive user's settings at HKEY_CURRENT_USER\Software\Classes. For more information on how these settings are merged, see Merged View of HKEY_CLASSES_ROOT.

Processes running in a security context other than that of the interactive user should not use the HKEY_CLASSES_ROOT key with the registry functions. Instead, such processes can explicitly open the HKEY_LOCAL_MACHINE\Software\Classes key to access the default settings. To open a registry key that merges the contents of HKEY_LOCAL_MACHINE\Software\Classes with the settings for a specified user, these processes can call the RegOpenUserClassesRoot function. For example, a thread that is impersonating a client can call RegOpenUserClassesRoot if it needs to retrieve a merged view for the client being impersonated. Note that RegOpenUserClassesRoot fails if the user profile for the specified user has not been loaded. The system automatically loads the profile for the interactive user when logging on. For other users, you need to call the LoadUserProfile function to explicitly load the user's profile.

If an application is run with administrator rights and User Account Control is disabled, the COM runtime ignores the per-user COM configuration and accesses only the per-machine COM configuration. Applications that require administrator rights should register dependent COM objects during installation to the per-machine COM configuration store (HKEY_LOCAL_MACHINE\Software\Classes). For more information, see AC: UAC: COM Per-User Configuration.

Hello everyone hope you all are having a wonderful day I have this issue that makes me think its not malware but not sure I had recently been experiencing problems with my pc like delay and recently found some weird chinese symbols in my registry ill show a picture at the bottom.

The entries appear to be for varying different types of picture file formats. They exist on one of my systems that has a lot of graphics programs installed but does not exist on another computer that has no graphics programs installed.

I'm trying to change permissions of some keys in HKCR (HKEY_CLASSES_ROOT) to get a misbehaving program working. I originally tried to script it, but realized that group policy can handle the change of permissions on registry keys. This works in my tests actually on keys in HKLM, but when I try to set perms on keys in HKCR, no workie. I know that there's no break between the client and AD with regard to group policy settings because as mentioned above, it does work for HKLM. Also, in rsop.msc on the client, it shows that the policy is in effect. I don't have any control over the choice of software, I have to use it. What am I missing?

As a result of moving from a WinXP box that didn't have a drive C: to a new Win7 64-bit Pro box with Laplink PCmover Professional doing its best to move applications intact, I have a few lingering issues with abandoned references to the old drive E:. I've eradicated most of them by persistent uninstall and reinstall of apps that cared (and simply discarding some that couldn't be made to see sense). Overall, PCmover made the transition pretty painless, aside from a few quirks like this one.

A search of the registry for references to E: has turned up a handful of entries under HKEY_CLASSES_ROOT\Installer\Assemblies where each key is named something like HKEY_CLASSES_ROOT\Installer\Assemblies\e:Program FilesReference AssembliesMicrosoftFrameworkv3.5Microsoft.Build.Conversion.v3.5.dll in which the reference to the old system drive is pretty clear.

--EDIT-- As further clarification, if all the software that originally placed those registry keys have been reinstalled, then you probably have nothing to worry about. the example that you provided refers to an assembly that MS Visual Studio and it's derivatives use to convert projects between Visual Studio versions. If nothing is expecting to find that registry key, then it is virtually harmless.

If you really don't want them there, then you could probably delete them. However, I do suggest caution, as this registry location also ties into the .Net GAC and if you remove references (even to files that are not there) then some software may become unstable or non-functional. Always, Always, Always backup your registry hives somehow before you do any editing.

Hey, Scripting Guy! I know that I am not supposed to mess around with the Registry on my computer, but the simple fact is that many times there are Registry values that need to be changed. In addition, there are always lots of TechNet articles that talk about changing the registry. So here is my question: In the past I used WMI to modify Registry settings. It worked. In fact, it worked remotely, but it was pretty much a mess. Does Windows PowerShell make it easier to edit the registry?

In Windows PowerShell 1.0, the Registry provider made it easy to work with the registry on the local system. Unfortunately, without remoting, you were limited to working with the local computer or using some other remoting mechanism (perhaps a logon script) to make changes on remote systems. With Windows PowerShell 2.0 the inclusion of remoting makes it possible to make remote registry changes as easily changing the local registry.

Additional registry drives are created by using the New-PSDrive cmdlet. For example, it is common to create a registry drive for the HKEY_CLASSES_ROOT registry hive. The code to do this is shown here.

When created, the new HKCR drive is accessible in the same way as any other drive. For example, to change the working location to the HKCR drive, use the Set-Location cmdlet or one of its aliases (such as cd). This technique is shown here.

To return only the value of the default property requires a bit of manipulation. The default property requires using literal quotation marks to force the evaluation of the parentheses in the name. This is shown here.

I invite you to follow me on Twitter and Facebook. If you have any questions, send email to me at scri...@microsoft.com, or post your questions on the Official Scripting Guys Forum. See you tomorrow. Until then, peace.

After digging into Windows 10 and discovering a rather interesting method for bypassing user account control, I decided to spend a little more time investigating other potential techniques for getting around UAC. Currently, there are a couple of public UAC bypass techniques, most of which require a privileged file copy using the IFileOperation COM object or WUSA extraction (Windows 7) to take advantage of a DLL hijack in a protected system location. All of these techniques require dropping a file to disk (for example, placing a DLL on disk to perform a DLL hijack). You can take a look at some of these public techniques here (by @hfiref0x). The technique covered in this post differs from the other public methods and provides a useful new technique that does not rely on a privileged file copy, code injection, or placing a traditional file on disk (such as a DLL). This technique has been tested on Windows 7 and Windows 10, but is expected to work on all versions of Windows that implement UAC.

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