a post here at TSP containing the tool
download from fl-guide.de
http://www.fl-guide.de/downloads.php?id=3
Just put the *.fmpa into the shizzolancer directory, run shizzolancer and you can choose the account.
For not creating a misunderstanding: shizzolancer is a german windows tool - you can also extract the ID and put it in every other account switching tool by open the *.fmpa file with a text editor using the above format. If you have a tool which is running with tiny Tux you may migrate it easily.
The MP ID is stored in the Registry of Windows - if wine supports registry functions you may also overwrite it by a script or directly.