You're a boss !
It's perfect now ! 😊 😊

The two parameters are correctly received by the program "probleme.exe"

I suppose the issue will be added to the next version 0.73. I will wait this version because I want to provide an installer of this dos program with inno setup.(It's a free program for learning maths at school.)

Thank's a lot.

PS : Just another minor default, but perhaps dosbox is not reponsible : a square around the mouse cursor is not refreshed when screen change in it. I join you a file showing the default. There is 3 little squares in the middle of the screen. They should be blank and they are not.
The problem not occurs when I run the program with XP command line.

Thank's again for your (quick) help.

The application strcats .sco to each of the arguments

The application strcats .sco only for the second argument.
The first one is a file with DAT extension. This dat file is in the same directory that probleme.exe.
Bye