Unlocks a region in an open file
_WinAPI_UnlockFile ( $hFile, $iOffset, $iLength )
|$hFile||Handle to the file that contains a region locked with _WinAPI_LockFile() function.|
|$iOffset||The starting byte offset in the file where the locked region begins.|
|$iLength||The length of the byte range to be unlocked.|
Unlocking a region of a file releases a previously acquired lock on the file. The region to unlock must correspond
exactly to an existing locked region. Two adjacent regions of a file cannot be locked separately and then unlocked
using a single region that spans both locked regions.
Search UnlockFile in MSDN Library.