WinAPI hook that replaces registry calls

Trying to bring any program to a portable version, I most often run into a registry problem. Many people like to keep their settings there, which makes them unbearable not portable (examples - Last.fm, ProcExp, etc).

An idea came up - write a launcher that will translate calls to a specific branch in the registry to write / read from a file (for example .ini)

Maybe Does such a program already exist? Googling did not lead to anything. You can try it yourself, but WinAPI knowledge is clearly not enough. Maybe someone has some developments in this direction?

Upd: YasonBy suggested ready-made solutions: JauntePE , BoxedApp . We will try!