This is an example of how to use Advanced INF Installer to prompt the user to specify a destination directory for your application. If the MS Office registry key and value name exist, and the registry key value is a valid directory on the user's system, Advanced Pack displays a dialog box asking the user if he would like to install in the office directory.
The flag value used is 1. To not prompt the user to accept the default destination, a flag value of 5 can be used instead.
HKLM,"SOFTWARE\Microsoft\Microsoft Office\95\InstallRoot","","Would you like to install this template in your office directory?","C:\MSOFFFICE"