Moves the stream pointer to a specified position using IStream::Seek.
_StreamSeek(ByRef $oStream[, $iMove[, $dwOrigin]])
| $oStream | IStream COM object. |
| $iMove | [optional] Number of bytes to move (default: 0). |
| $dwOrigin | [optional] Starting point (default: $STREAM_SEEK_CUR). |
| Success: | New position of the stream pointer. |
| Failure: | 0, sets @error to: 1 - Invalid stream object. 2 - COM error (HRESULT in @extended). |