Windows 10: What are Shell Extensions in the Registry and Why Are They Different on Each System

in the Registry, under HKEY Users > S-1-5-18 > Software > Microsoft > Windows > CurrentVersion > Shell Extensions > Cached, there is a list of keys with the type "Reg Binary"I would like to know what these are and if these keys are related to the "interface" Shell, or PowerShell, because the way Windows names these 2 different components has always caused confusion for mesecondly, is it normal for 2 systems to have different keys and a different number of them? my PC has 17 of these keys under Shell Extensions > Cached, while my laptop has 12 of them instead. the last 3

:)

 

"This file does not have a program associated with it for performing this action,please install a program or create a association in the Default Programs control panel" error message in Windows 10

Download folder association registry fix
from here (zipped). Unzip and double-click the enclosed REG file.

Logoff and login back.

If that doesn't fix the problem, next step is to download a tool named ShellExView and disable these context menu handler shell extensions (to test):

• AVG Disk Space Explorer Shell Extension
• AVG Shredder Shell Extension
• DropboxExt
• IObitUnstalerKaspersky
• Anti-Virus 16.0.0
• TuneUp Shredder Shell Extension
• TuneUp Disk Space Explorer Shell Extension

You may refer to this page that explains how to use
Shellexview. After disabling the extensions, logoff and login back. See if that resolves the problem. If so, the next step is to narrow down which one of the above extensions causes the problem.

 

Extensions unresponsive

Hi,



I realized your concern and will assist you to resolve the issue.

I suggest you to follow the steps below and check if it helps.

• 
  Settings > System > Apps & Features > Uninstall the problem Edge Extension(s)
  
• 
  Go to Store > manually search the store for the extension, then install it again.
  

After it's installed, click the 'Launch' button and it will take you to Edge where you can set it up.



Your reply is very important for us to ensure a proper resolution. Please get back to us with the above information in order to assist you accordingly.

Thanks and regards.

 

Change registry values of user shell folders: Some folders are missing in registry (contacts, searches, and savedgames)

They have slightly different effects but I never took the time to explore the details. You would need to do a Google search.

I found this:

Registry: differences between Shell Folders and User Shell Folders? Solved - Windows 7 Help
Forums

The entries in this subkey can appear in both the Shell Folders subkey and the User Shell Folders and in both HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER. The entries that appear in user User Shell Folders
take precedence over those in Shell Folders. The entries that appear in HKEY_CURRENT_USER take precedence over those in HKEY_LOCAL_MACHINE. \Shell Folders exists for backwards compatibility apparently.