thanks you for your reply !
i've retrieve the language regionnal settings with script !
my project is a basic msi !
here is it my code :
I must to do that because when a user remove one of our product the user must be close the program before to remove the product !
NumToStr( szLang, LOWORD( SYSINFO.nUserLangID ) );
//szLang contains => 1033, 1040 or it all depends on language
/** SWITCH FOR TO HAVE THE LANGUAGE **/
szMsg = "Please close the program before removing.";
thanks you for your information, for your time and so on !
Great product installshield but too big to learn all possibility !!!