Option Explicit
Public Declare Function RegComCtl32 Lib "KewlButtonz.ocx" Alias "DllRegisterServer" () As Long
Public Declare Function UnRegComCtl32 Lib "KewlButtonz.ocx" Alias "DllUnregisterServer" () As Long
Public Const S_OK = &H0
Sub RegisterComCtl32()
On Error GoTo Err_Registration_Failed
    If RegComCtl32 = S_OK Then
        MsgBox "Archivo registrado"
    Else
        MsgBox "Archivo no registrado"
    End If
    Exit Sub
Err_Registration_Failed:
MsgBox "Error: " & Err.Number & " " & Err.Description
End Sub
Sub UnRegisterComCtl32()
On Error GoTo Err_Unregistration_Failed
    If UnRegComCtl32 = S_OK Then
        MsgBox "Archivo desregistrado"
    Else
        MsgBox "Archivo no desregistrado"
    End If
Exit Sub
Err_Unregistration_Failed:
MsgBox "Error: " & Err.Number & " " & Err.Description
End Sub