Where is this "Applications" Directory in Windows located?

shell:appsfolder is a shortcut for explorer.exe shell:::{4234d49b-0245-4df3-B780-3893943456e1}

{4234d49b-0245-4df3-B780-3893943456e1} is called the CLSID Key, it's a GUID to access special folders.

I found a list of other valid GUID : here

You can run explorer.exe shell:::{4234d49b-0245-4df3-B780-3893943456e1}

Actually I found the solution: open the run dialog, and use the command "Shell:AppsFolder"