Multi-user compatibility in Windows games

When Windows 98 was made available, multi-user experience was introduced to the PC gaming public. It allows a family to share the same computer, each one having his own data, his own preferences for the shared applications. Now, Windows XP adds security features, which can prevent each user to alter or even see the data from an other user of the computer. In a networked context, compromised programs that are run by limited users would not comprise the entire computer. Multi-user is easy: instead of saving the data under Program Files (the directory for the files of the program, not the files of the users), the program saves in the user directory, whose name is get by a call to SHGetSpecialFolderLocation.

Except that some popular applications that connects to the Internet, that open ports, that are released early with no serious security testing, that are specifically designed for a family use, are not compatible with a multi-user usage. These programs are made by peoples that learned programming in a single user environment, MS-DOS, and that do not know the simple basis of modern operating system architecture, compromising security and weakening user experience. Microsoft is aware of this problem, even if it does not its job of editor and releases games that are not compatible, and delivers a "Game for Microsoft Windows" logo that is very easy to obtain and this petition encourages the game developers and editors to conform to these specifications.

Game developers, take the two hours needed to read and implement multi-user compatibility in your games!

Some references:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndxgen/html/GAMESSF1.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/reference/functions/shgetspecialfolderlocation.asp