Click succeeds but window does not open

[the_over_ape]

Hi guys, Sorry I am very new to AutoIt. I have tried quite a few stuffs and read quite a few posts on these forums but I cannot get this simple click to work.

If I click on "openfile..." manually it of course open a standard windows dialogue to choose a file. Bellow, it does not. 
Memtool is free of charge if you wanna try, you can download it here

$Success= ControlClick("Infineon - Memtool 4.9 on mPAD with TC39x B-Step (DAS)", "", "[CLASS:Button; INSTANCE:2]")

Switch $Success
    Case 0
        MsgBox(16,"Autoit","ControlClick Failed")
    Case 1
        MsgBox(0,"Autoit","ControlClick Success")
EndSwitch

[Trong]

It work on my pc:

;#RequireAdmin
WinActivate("Infineon", "")
Local $Success= ControlClick("Infineon", "", "[CLASS:Button; INSTANCE:2]")

If $Success Then
    MsgBox(32+262144,"Autoit","ControlClick Success", 5)
Else
    MsgBox(16+ 262144,"Autoit","ControlClick Failed", 5)
EndIf

 

[the_over_ape]

WinActivate("Infineon - Memtool 4.9 on mPAD with TC39x B-Step (DAS)", "")

This is what I was missing... I am surprised it work with just "Infineon" though. 
Thank you very much!