The drives in Windows PowerShell are made available to your session by Windows PowerShell providers, which are .NET Framework assemblies that make the data in a specialized data store available in Windows PowerShell so that you can easily view and manage the data. For information about Windows PowerShell providers, type:
get-help about_providers
To see a list of Windows PowerShell providers, type:
get-psprovider
For a list of provider help files, type:
get-help -category provider
For information about a particular provider, type:
get-help <provider-name>
For example,
get-help registry