Как определить готовность файла?

Option Explicit
 
'**********************************************************
' Описания для установки приоритета процесса
'----------------------------------------------------------
Public Enum PriorityEnum
  NORMAL_PRIORITY_CLASS = &H20
  IDLE_PRIORITY_CLASS = &H40
  HIGH_PRIORITY_CLASS = &H80
End Enum
 
Private Declare Function GetCurrentProcess Lib 'kernel32' () As Long
Private Declare Function SetPriorityClass Lib 'kernel32' (ByVal hProcess As Long, ByVal dwPriorityClass As Long) As Long
 
'**********************************************************
' Описания для исполнения коммандной строки
'----------------------------------------------------------
Public Enum WindowStyle
  SW_HIDE = 0
  SW_NORMAL = 1
  SW_MAXIMIZE = 3
  SW_MINIMIZE = 6
End Enum
 
Private Declare Function CreateProcessA Lib 'kernel32' (ByVal lpApplicationName As Long, ByVal lpCommandLine As String, ByVal lpProcessAttributes As Long, ByVal lpThreadAttributes As Long, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, ByVal lpEnvironment As Long, ByVal lpCurrentDirectory As Long, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
Private Declare Function WaitForSingleObject Lib 'kernel32' (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
Private Declare Function GetExitCodeProcess Lib 'kernel32' (ByVal hProcess As Long, lpExitCode As Long) As Long
Private Declare Function CloseHandle Lib 'kernel32' (ByVal hObject As Long) As Long
Private Const INFINITE = -1&
Private Const STARTF_USESHOWWINDOW = &H1
Private Type STARTUPINFO
  cb As Long
  lpReserved As String
  lpDesktop As String
  lpTitle As String
  dwX As Long
  dwY As Long
  dwXSize As Long
  dwYSize As Long
  dwXCountChars As Long
  dwYCountChars As Long
  dwFillAttribute As Long
  dwFlags As Long
  wShowWindow As Integer
  cbReserved2 As Integer
  lpReserved2 As Long
  hStdInput As Long
  hStdOutput As Long
  hStdError As Long
End Type
Private Type PROCESS_INFORMATION
  hProcess As Long
  hThread As Long
  dwProcessID As Long
  dwThreadID As Long
End Type
 
'**********************************************************
' Описания для получения статуса клавиши
'----------------------------------------------------------
Public Enum VKeyEnum
  VK_SHIFT = &H10
  VK_CONTROL = &H11
  VK_LSHIFT = &HA0
  VK_RSHIFT = &HA1
  VK_LCONTROL = &HA2
  VK_RCONTROL = &HA3
End Enum
 
Private Declare Function GetKeyState Lib 'user32' (ByVal nVirtKey As Long) As Integer
Private Declare Function GetAsyncKeyState Lib 'user32' (ByVal vKey As Long) As Integer
 
'**********************************************************
' Запуск программы
'----------------------------------------------------------
Public Declare Function ShellExecute Lib 'shell32.dll' Alias 'ShellExecuteA' (ByVal hWnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
 
'**********************************************************
' Остановка процесса
'----------------------------------------------------------
Public Declare Sub Sleep Lib 'kernel32' (ByVal dwMilliseconds As Long)
 
'**********************************************************
' Установка приоритета текущего процесса
'----------------------------------------------------------
Public Sub SystemSetPriority(Priority As PriorityEnum)