Jesper

> These files are read-only to users by default. Only administrative programs
> can modify them.

Modifying the contents of these files is fine. Modifying the behavior of
them is not a good plan. The fact that nobody has reported problems is most
likely due to the fact that your app is the only 16-bit app these users have,
so you are saved by writing to a 15-year old model. That said, I think you
should update the app to 32-bits, or better yet, both 32 and 64\. You will
lose a significant portion of the market otherwise as 64-bit Vista does not
have a 16-bit subsystem.