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This function rewrite whole content of given file by defined (implicitly 0x0) character and finally delete it, it's called as secure deleting. This should be VERY fast!! Just note that there is no error checking inside FileWipe() Maybe I will post later also version with error checking. You can comment line FileDelete($sFileName) to see how it's rewritten before deletion. EDIT: There can be problems with too big files (>2GB or > amount of RAM) see post #8 by Kafu #include <WinAPI.au3> ; prepare testing file FileDelete('1.txt') FileWrite('1.txt','123abc') FileWipe('1.txt') Func FileWipe($sFileName, $nByte = 0x0) If Not FileExists($sFileName) Then Return $iSize = FileGetSize($sFileName) $hFile = _WinAPI_CreateFile($sFileName, 2, 6) $hMapping = _WinAPI_CreateFileMapping($hFile) $pAddress = _WinAPI_MapViewOfFile($hMapping) MemSet($pAddress, $nByte, $iSize) _WinAPI_UnmapViewOfFile($pAddress) _WinAPI_CloseHandle($hMapping) _WinAPI_CloseHandle($hFile) FileDelete($sFileName) EndFunc Func MemSet($pDest, $nChar, $nCount) DllCall("msvcrt.dll", "ptr:cdecl", "memset", "ptr", $pDest, "int", $nChar, "int", $nCount) If @error Then Return SetError(1,0,False) Return True EndFunc ; from WinAPIEx - just simplified for this purpose Func _WinAPI_CreateFileMapping($hFile) Local $Ret = DllCall('kernel32.dll', 'ptr', 'CreateFileMappingW', 'ptr', $hFile, 'ptr', 0, 'dword', 0x4, 'dword', 0, 'dword', 0, 'ptr', 0) If (@error) Or (Not $Ret[0]) Then Return SetError(1, 0, 0) Return $Ret[0] EndFunc Func _WinAPI_MapViewOfFile($hMapping) Local $Ret = DllCall('kernel32.dll', 'ptr', 'MapViewOfFile', 'ptr', $hMapping, 'dword', 0x6, 'dword', 0, 'dword', 0, 'dword', 0) If (@error) Or (Not $Ret[0]) Then Return SetError(1, 0, 0) Return $Ret[0] EndFunc Func _WinAPI_UnmapViewOfFile($pAddress) DllCall('kernel32.dll', 'int', 'UnmapViewOfFile', 'ptr', $pAddress) If @error Then Return SetError(1, 0, 0) Return 1 EndFunc Here is my first test version without memory mapped files: Func FileWipe($sFileName, $nByte = 0x0) If Not FileExists($sFileName) Then Return $iSize = FileGetSize($sFileName) $tBuffer = DLLStructCreate("byte[" & $iSize & "]") MemSet(DLLStructGetPtr($tBuffer), $nByte, $iSize) $hFile = _WinAPI_CreateFile($sFileName, 2, 6) _WinAPI_WriteFile($hFile, DLLStructGetPtr($tBuffer), $iSize, $iSize) _WinAPI_CloseHandle($hFile) FileDelete($sFileName) EndFunc