Hide close [X] button on excel vba userform for my progress bar

Question

I created a userform to show a progress bar when the macro is still importing sheets

Answer 1

This is an improvement of the above answer of @Peter Albert

• Windows API calls are now Office x64 safe
• FindWindow call was improved to find Excel UserForms only. The function in the original answer searches every window class (e.g. Explorer windows and other program's windows). Therefore it could happen that the [x] button of other programs or explorer windows have been removed when their name was the same name as the UserForm.

---

Private Const mcGWL_STYLE = (-16)
Private Const mcWS_SYSMENU = &H80000

'Windows API calls to handle windows
Private Declare PtrSafe Function FindWindow Lib "user32" Alias "FindWindowA" ( _
    ByVal lpClassName As String, ByVal lpWindowName As String) As LongPtr
  
#If Win64 Then
    Private Declare PtrSafe Function GetWindowLongPtr Lib "user32" Alias "GetWindowLongPtrA" ( _
        ByVal hwnd As LongPtr, ByVal nIndex As Long) As LongPtr
    Private Declare PtrSafe Function SetWindowLongPtr Lib "user32" Alias "SetWindowLongPtrA" ( _
        ByVal hwnd As LongPtr, ByVal nIndex As Long, ByVal dwNewLong As LongPtr) As LongPtr
#Else
    Private Declare PtrSafe Function GetWindowLongPtr Lib "user32" Alias "GetWindowLongA" ( _
        ByVal hwnd As LongPtr, ByVal nIndex As Long) As LongPtr
    Private Declare PtrSafe Function SetWindowLongPtr Lib "user32" Alias "SetWindowLongA" ( _
        ByVal hwnd As LongPtr, ByVal nIndex As Long, ByVal dwNewLong As LongPtr) As LongPtr
#End If

Public Sub RemoveCloseButton(objForm As Object)
    Dim lngStyle As LongPtr
    Dim lngHWnd As LongPtr
    
    Dim lpClassName As String
    lpClassName = vbNullString
    If Val(Application.Version) >= 9 Then
       lpClassName = "ThunderDFrame"
    Else
       lpClassName = "ThunderXFrame"
    End If
    
    lngHWnd = FindWindow(lpClassName, objForm.Caption)
    lngStyle = GetWindowLongPtr(lngHWnd, mcGWL_STYLE)

    If lngStyle And mcWS_SYSMENU > 0 Then
        SetWindowLongPtr lngHWnd, mcGWL_STYLE, (lngStyle And Not mcWS_SYSMENU)
    End If
End Sub

ThunderDFrame?
The UserForms in Excel are actually of the Windows class ThunderDFrame, which is the class for all UserFroms in Microsoft Office applications after 2002. Before that, it was ThunderXFrame.