>>Thanks a lot for your answer,

you´re welcome.

>>I used your code in my main.prg under the command :
>>MODIFY WINDOW SCREEN TITLE "app caption" ICON FILE XXX.ICO NOCLOSE
>>and the lnWinHandle = 1928 the first time the i am starting the .exe
>>Any idea

hmmmm... I never tried to modify Screen caption as you´re doing...
try to define your screen caption with a command like this:

_Screen.Caption = "app caption"