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A process of mine opens a HML file, modifies it and then saves, closes it. I then need to run an.exe that opens this file right after this.. However, nothing that I find on this forum works that supposedly tests to see if the fie is still open, ready to be used by another process. Right now, I just Sleep(2000) . I would like something cleaner than this. This function, for example, returns False when nothing has it opened or if I open the file with notepad or any other editor. I am running on a win7 laptop, if that has any bearing. $File="C:\Utilities\test\report.hr5" MsgBox(0,"", _FileInUse($File)) Exit Func _FileInUse($sFilePath) ; By Nessie. Modified by guinness. Local Const $hFileOpen = _WinAPI_CreateFile($sFilePath, $CREATE_ALWAYS, $FILE_SHARE_WRITE) If $hFileOpen Then _WinAPI_CloseHandle($hFileOpen) Return False EndIf Local $fReturn = False If _WinAPI_GetLastError() = 32 Then $fReturn = True Return $fReturn EndFunc