FileOpenDialog to $Launcher

Hey I am trying to select a File using the FileOpenDialog, which then is converted to a variable which i want to use later. My code looks like this:

$code = FileOpenDialog ("Select File",@DesktopDir,"Executables (*.exe)",1+2)


Case $restart
    EndSwitch
    If $bCheck Then
        If Not ProcessExists($var) And Not ProcessExists("asd.exe") Then
    ShellExecute($code)
        EndIf
    EndIf

To explain it more detailed:

I want to let the user set the File to restart, if 2 Processes arent running. For that, i got an Inputline in KODA, where you would have to type the name of the first process, being $var, and a button for the FileOpenDialog to  select the File which shall be started in $code.

(Sorry for my bad English ;( i'm german.)