WshShell.AppActivate doesn't seem to work in simple vbs script

I've tried it, too, and couldn't get it to work. There must be something about the window class, perhaps, where AppActivate doesn't see it as a top-level window?

In any event, AppActivate also lets you pass the process ID instead of the window title. When I installed HostsMan, the process name was hm.exe, so I'll use that in my example below.

Set Processes = GetObject("winmgmts:").InstancesOf("Win32_Process")

For Each Process In Processes
    If StrComp(Process.Name, "hm.exe", vbTextCompare) = 0 Then

        ' Activate the window using its process ID...
        With CreateObject("WScript.Shell")
            .AppActivate Process.ProcessId
            .SendKeys "%{F4}"
        End With

        ' We found our process. No more iteration required...
        Exit For

    End If
Next

To solve the problem of AppActivate you have to use loop and if condition statement to check if the active windows is the target windows or not because sometime you deselect or the system deselect the target windows before execute the sendkeys directly so you got error.

I create this tight strict way

Set WshShell = CreateObject("WScript.Shell")
    for i=0 to 300 ' this loop will continue about 30 sec if this not enough increase this number
        Rtn=WshShell.AppActivate("HostsMan") ' HostMan have to be the windows title of application or its process ID
        If Rtn = True Then 
            WshShell.SendKeys "%{F4}"    ' send key to click ALT+F4 to close 
            wscript.sleep 100        ' stop execute next line until finish close app
            Rtn=WshShell.AppActivate("HostsMan") 
             If Rtn=False Then ' using nested If to sure of selected windows is false because its close 
               Exit For      ' exit for loop directly and execute what after for next
             End If 
        End If
        wscript.sleep 100
    Next