Является ли FindWindowPartial API чем-то полезным для вас? Это позволит вам искать окна с Microsoft Word в заголовке.
Option Explicit
Private Const GW_HWNDNEXT = 2
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long
Function FindWindowPartial(ByVal Title As String) As String
Dim hWndThis As Long
hWndThis = FindWindow(vbNullString, vbNullString)
While hWndThis
Dim sTitle As String, sClass As String
sTitle = Space$(255)
sTitle = Left$(sTitle, GetWindowText(hWndThis, sTitle, Len(sTitle)))
If InStr(sTitle, Title) > 0 Then
FindWindowPartial = sTitle & "|" & FindWindowPartial
End If
hWndThis = GetWindow(hWndThis, GW_HWNDNEXT)
Wend
End Function