The problem has been solved !
Thank you all for the clues you gave… and I was able to put my program online !
I insert the link of my program written in XoJo: LINK
I don’t think I’m doing the wrong thing (I mean insert the link of my program to show you what I have / I’m combining with XoJo), but if so feel free to have the link deleted by an administrator, okay ?
XoJo allowed me to write this program despite my free time almost gone to zero! With Visual Studio who knows how long it would take ?
Now I keep updating it, improving it, speeding it up, adding new features, …