Windows 10: Strange Environment Variable in Windows 11 cmd.exe / Powershell

In Windows 11 23H2, I realized that there is a strange environment variable set named EFC_nnnnn where nnnnn is a number, randomly generated each log in.Examples:cmd.exeC:\Users\developer>set EFCEFC_11580=1PowershellPS C:\Users\developer> Get-ChildItem Env: Where-Object {$_.Name -like 'EFC*'}Name Value---- -----EFC_11580 1What application/registry key set this variable, and it is used for? Even a new install of Windows 11 23H2 has this a Hyper-V VM.I have searched all the batch/cmd files on all my drives and didn't find any thing that can possibly set this variable. It isn't set in

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System environment variable won't stick

Running Win10 Home on an Acer Spin 3, 64bit, i7cpu. I try to add a path to the system environment variables by:

1. Control Panel > System > Advanced system settings > Advanced tab > Environment variables

2. The "Environment Variables" window opens.
3. In the "System Variables" pane I select "Path" and click the EDIT button.
4. A list of the current system paths is displayed.
5. I click the NEW button, browse to the path I want to add which is "C:\Python36-32" and click OK. The path "C:\Python36-32" is added to the list of current system paths.
6. I click OK and am returned to the "Environment Variables" window.
7. I click the "X" at the top right to close the "Environment Variables" window.

Now if I click the "Environment Variables" button again (end of step-1) and repeat steps 2-4, the new path I added in step-5 is gone. IOW, adding a new path won't stick.

What am I doing wrong?

 

Environment variable troubles

Well, I need to add a new environment variable to PATH and I have tried to do so through the GUI and PowerShell command lines. However even after I've done this PowerShell and Cmd both can't find the variable and end up redirecting me to the Microsoft store. The variable is a python executable for further elaboration. The path does show up in the PATH environment variables GUI but for whatever reason the system can't find it. Any help is greatly appreciated.

 

Searching environment variable in list

I'm using a command that gives me a list of environment variables. When searching in the list, I want to find all environment variables with the word
EXTERNAL; using the following command all that is occurring is all the environment variables are being listed instead of those environment variables with the word
EXTERNAL ?

findstr /c "EXTERNAL"