Como despejar todas as nossas imagens de um campo VARBINARY(MAX) no SQL Server 2008 para o sistema de arquivos?

SET NOCOUNT ON

DECLARE @IdThumbnail INTEGER,
        @MimeType VARCHAR(100),
        @FileName VARCHAR(200),
        @Sqlstmt varchar(4000)


DECLARE Cursor_Image CURSOR FOR
    SELECT a.IdThumbnail
    FROM tblThumbnail a
    ORDER BY a.IdThumbnail

OPEN Cursor_Image
    FETCH NEXT FROM Cursor_Image INTO @IdThumbnail

    WHILE @@FETCH_STATUS = 0
    BEGIN

        -- Generate the file name based upon the ID and the MIMETYPE.
        SELECT @FileName = LTRIM(STR(@IdThumbnail)) + '.png'

        -- Framing DynamicSQL for XP_CMDshell            
        SET @Sqlstmt='BCP "SELECT OriginalImage 
                      FROM Appian.dbo.tblThumbnail 
                      WHERE IdThumbnail = ' + LTRIM(STR(@IdThumbnail)) +
                      '" QUERYOUT c:\Temp\Images\' + LTRIM(@FileName) + 
                      ' -T -fC:\Temp\ImageFormatFile.txt'
        print @FileName
        print @sqlstmt

        EXEC xp_cmdshell @sqlstmt
        FETCH NEXT FROM Cursor_Image INTO @IdThumbnail
    END

CLOSE Cursor_Image
DEALLOCATE Cursor_Image

10.0
1
1       SQLIMAGE            0       0       ""   1     OriginalImage                      ""