DECLARE	@bin BINARY(8) = 0x0d4081fc676aac10

DECLARE	@ns BIGINT = @bin,
	@d DATETIME = '02/05/2010 10:20:56 AM'

SELECT	@ns,
	DATEADD(s, @ns / 1000000000, '19800101')

DECLARE	@Sample TABLE
	(
		f CHAR(5),
		lastmod CHAR(16),
		filedate DATETIME
	)

INSERT	@Sample
VALUES	('File1', '0d4081fc676aac10', '2/5/2010 10:20'),
	('File2', '0c03f1fc676aac10', '2/5/2010 10:20'),
	('File3', '0c18164bf2f7ac10', '12/17/2009 10:43'),
	('File4', '0bbe32fc676aac10', '2/5/2010 10:20'),
	('File5', '0a6a82fc676aac10', '2/5/2010 10:20'),
	('File6', '46bd5b9873db9c10', '4/14/2009 14:30'),
	('File7', '0a88d2fc676aac10', '2/5/2010 10:20')

;WITH cteYak
AS (
	SELECT	f,
		filedate,
		CAST('' AS XML).value('xs:hexBinary(sql:column("Yak"))', 'BINARY(8)') AS Bin
	FROM	(
			SELECT	f,
				filedate,
				REVERSE(lastmod) AS Yak
			FROM	@Sample
		) AS d
)
SELECT	f,
	filedate,
	CAST(DATEADD(SECOND, Sec, DATEADD(MINUTE, Peso, 0)) AS DATETIME2(0)) AS Peso
FROM	(
		SELECT	f,
			filedate,
			CAST((CAST(Bin AS BIGINT) - CAST(94354848000000000.0 AS BIGINT)) / 10000000 / 60 AS INT) AS Peso,
			CAST((CAST(Bin AS BIGINT) - CAST(94354848000000000.0 AS BIGINT)) / 10000000 % 60 AS INT) AS Sec
		FROM	cteYak
	) AS d