you can access this special folders by typing the "shell:xxxx" command in the adress bar of Windows Explorer or by running command [WIN] + R. I’ve tested them with Win 10 1809 pro version.

Start Menu locations (current user)

• shell:Start Menu : current user’s Start Menu root folder
• shell:Programs : current user’s Start Menu programs folder
• shell:Administrative Tools : current user’s Start Menu administrative tools folder
• shell:Startup : current user’s app that start with windows (place a shortcut here to launch this app on startup)
• shell:Quick Launch : quick launch tool bar content

Users / account locations

• shell:AccountPictures : your accounts’ avatars
• shell:PublicAccountPictures : your public accounts’ avatars
• shell:UserProfiles : location of user home directories (i.e. C:\Users)

Current user files locations

• shell:MyComputerFolder : my computer folder
• shell:Desktop : current user’s desktop folder
• shell:UsersFilesFolder / shell:Profile : root of user’s home folder
• shell:Personal : current user my documents folder
• shell:My Pictures : current user image/photos folder
• shell:My Video: current user video folder
• shell:3D Objects : current user 3D object folder
• shell:Downloads : current user download folder
• shell:My Music : current user music folder
• shell:Camera Roll : current user camera roll folder
• shell:Screenshots : current user screenshots folder
• shell:Captures : current user video capture folder

OneDrive locations

• shell:OneDrive : one drive root folder
• shell:OneDriveDocuments : one drive documents folder
• shell:OneDrivePictures : one drive pictures folder
• shell:OneDriveCameraRoll : one drive camera roll folder
• shell:OneDriveMusic : one drive music folder

Misc

• shell:ControlPanelFolder : display control panel
• shell:Contacts : internal Windows contacts manager
• shell:PrintersFolder : printers
• shell:Fonts : fonts
• shell:SendTo : content of ‘send to’ contextual menu
• shell:CD Burning : temporary folder for data to burn on disc
• shell:RecycleBinFolder : recycle bin content
• shell:AddNewProgramsFolder : Install new software from network
• shell:ChangeRemoveProgramsFolder : modify/remove installed application

Network

• shell:NetworkPlacesFolder : network neighbors
• shell:NetHood : network shortcuts
• shell:ConnectionsFolder : network connections
• shell:Favorites : your internet explorer bookmarks

Applications / AppData

• shell:AppsFolder : display all installed apps (standards & universals/store apps)
• shell:AppData : current user’s AppData roaming folder
• shell:Local AppData : current user’s AppData local folder
• shell:LocalAppDataLow : current user’s AppData low folder
• shell:Common AppData : common ProgramData folder
• shell:AppUpdatesFolder : display the list of Windows/applications updates installed
• shell:UserProgramFiles : current user’s AppData\Local\Programs folder
• shell:UserProgramFilesCommon : current user’s AppData\Local\Programs\Common folder

Games

• shell:GameTasks : current user’s game explorer folder
• shell:PublicGameTasks : common game explorer folder
• shell:SavedGames : saved games

System locations

• shell:ProgramFiles : default program files folder for your Windows version (32 or 64)
• shell:ProgramFilesX86 : i.e. C:\Program Files (x86)
• shell:ProgramFilesX64 : i.e. C:\Program Files
• shell:ProgramFilesCommon : default common files for your Windows version (32 or 64)
• shell:ProgramFilesCommonX86 : i.e. C:\Program Files (x86)\Common Files
• shell:ProgramFilesCommonX64 : i.e. C:\Program Files\Common Files
• shell:System : i.e. C:\Windows\System32
• shell:SystemX86 : i.e. C:\Windows\SysWOW64
• shell:Windows : i.e. C:\Windows

Synchronization configuration

• shell:SyncSetupFolder : setup synchronisation partnerships
• shell:SyncResultsFolder : synchronisation results
• shell:SyncCenterFolder : synchronisation center
• shell:ConflictFolder : synchronisation conflicts

Security

• shell:SystemCertificates : AppData\Roaming\Microsoft\SystemCertificates folder
• shell:CryptoKeys : cryptographic keys

Start Menu locations (all users)

• shell:Common Start Menu : all users Start Menu root folder
• shell:Common Programs : all users’ start menu program folder
• shell:Common Administrative Tools : all users’ start menu administrative tools folder
• shell:Common Startup : all users’ app that start with windows (place a shortcut here to launch this app on startup for all users)

Public files locations (all users)

• shell:Public : common/public folders root
• shell:CommonVideo : common/public video folder
• shell:CommonMusic : common/public music folder
• shell:CommonDownloads : common/public download folder
• shell:CommonPictures : common/public picture folder
• shell:Common Documents : common/public documents folder
• shell:Common Desktop : common/public desktop folder

Libraries locations (Win 7 libraries, still partialy exist un Win 10)

• shell:Libraries / shell:UsersLibrariesFolder : current user all libraries
• shell:PublicLibraries : common/public all libraries
• shell:MusicLibrary : music library
• shell:CameraRollLibrary : camera roll library
• shell:RecordedTVLibrary : recorded tv library
• shell:VideosLibrary : videos library
• shell:DocumentsLibrary : documents library
• shell:PicturesLibrary : pictures library
• shell:SavedPicturesLibrary saved pictures library