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'Fuente Recursosvb (no encuentro el link)

Option Explicit

' Crea la región
Private Declare Function CreateRoundRectRgn Lib "gdi32" ( _
    ByVal X1 As Long, _
    ByVal Y1 As Long, _
    ByVal X2 As Long, _
    ByVal Y2 As Long, _
    ByVal X3 As Long, _
    ByVal Y3 As Long) As Long

'Establece la región
Private Declare Function SetWindowRgn Lib "user32" ( _
    ByVal hwnd As Long, _
    ByVal hRgn As Long, _
    ByVal bRedraw As Boolean) As Long


Private Sub Redondear_Formulario(El_Form As Form, Radio As Long)


Dim Region As Long
Dim ret As Long
Dim Ancho As Long
Dim Alto As Long

'Obtenemos el ancho y alto de la region del Form
Ancho = El_Form.Width / Screen.TwipsPerPixelX
Alto = El_Form.Height / Screen.TwipsPerPixelY

'Le pasamos el ancho alto del formualrio y el valor de _
 redondeo es decir el radio

Region = CreateRoundRectRgn(0, 0, Ancho, Alto, Radio, Radio)

' Aplica la región al formulario
ret = SetWindowRgn(El_Form.hwnd, Region, True)

End Sub


Private Sub Form_Load()
  
  Call Redondear_Formulario(Me, 10)

End Sub

Option Explicit

Private Declare Function CreateRoundRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long, ByVal X3 As Long, ByVal Y3 As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hwnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long

Private Sub Form_Load()
  Call SetWindowRgn(Me.hwnd, CreateRoundRectRgn(0, 0, Me.Width / 15, Me.Height / 15, 10, 10), True)
End Sub