This program is made to edit the Windows Vista and Windows 7 user "Tile" also called the "Profile Picture" by modifying the binary blob stored under the registry key :

HKEY_LOCAL_MACHINE\SAM\SAM\Domains\Account\Users

As this part of the registry is normally usable only by the system you will need SysInternals PsExec to execute it under the "Local System" account. For example to list all users stored in the registry run as an administrator :

psexec -S "C:\bin\UserTile.exe" --list

(All the path must be absolute)

Must be specified for all commands that require an user name

List the name of all users present in the registry

UserTile --list

Export the tile to a bitmap file

UserTile --user vbfox --export C:\tile.bmp

Set a new tile for the user. All the formats supported by the .Net framework are supported. The image will be croped to a (centered) square, resized to 126x126 and converted to 16 bits per pixel colors.

UserTile --user vbfox --set C:\tile.jpg

I want to thank Micah Rowland and it's blog post on Xtreme Deployment for the first hints on where the tiles are stored and a basic analysis of the binary format.