How do I use -Credential parameter?

There are some buildin cmdlets with -Credential parameter (for example
those *-Item cmdlet). But when I used those cmdlet with -Credential, I
always got an error (no matter it is Filesystem provider or registry
provider).

Is there something I did wrong or Is it designed to act like that?

=======================================================
C:\WINDOWS> new-item . -Name my.txt -type "file"
new-item : Access to the path 'C:\WINDOWS\my.txt' is denied.
At line:1 char:9
+ new-item <<<< . -Name my.txt -type "file"
=======================================================
C:\WINDOWS> new-item . -Name my.txt -type "file" -Credential Admin

Credential Information
Please enter your credentials.
Password for user Admin: ******

new-item : Dynamic parameters for the Cmdlet cannot be retrieved.
Invocation of
MakePath on the 'FileSystem' provider failed for path 'C:\'. Cannot
call metho
d. The provider does not support the use of credentials.
At line:1 char:9
+ new-item <<<< . -Name my.txt -type "file" -Credential Admin
=======================================================
C:\WINDOWS> $me=get-credential

Cmdlet get-credential at command pipeline position 1
Supply values for the following parameters:
Credential
User: Admin
Password for user Admin: ******

C:\WINDOWS> new-item . -Name my.txt -type "file" -Credential $me
new-item : Dynamic parameters for the Cmdlet cannot be retrieved.
Invocation of
MakePath on the 'FileSystem' provider failed for path 'C:\'. Cannot
call metho
d. The provider does not support the use of credentials.
At line:1 char:9
+ new-item <<<< . -Name my.txt -type "file" -Credential $me
=========================================================

.

Relevant Pages

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