DECLARE @fileid int, @page int
SET @fileid =  1 
SET @page =  824 
SELECT first, OBJECT_NAME(id)
  FROM sysindexes si
 INNER JOIN sysfiles sf
   ON si.groupid = sf.groupid
 WHERE @fileid = CONVERT (VARCHAR ( 2 ), (CONVERT (INT, SUBSTRING (first,  6 ,  1 )) * POWER ( 2 ,  8 )) + (CONVERT (INT, SUBSTRING (first,  5 ,  1 ))))
   and @page >= (CONVERT (INT, SUBSTRING (first,  4 ,  1 )) * POWER ( 2 ,  24 )) + (CONVERT (INT, SUBSTRING (first,  3 ,  1 )) * POWER ( 2 ,  16 )) + (CONVERT (INT, SUBSTRING (first,  2 ,  1 )) * POWER ( 2 ,  8 )) + (CONVERT (INT, SUBSTRING (first,  1 ,  1 )))
   and @page < (CONVERT (INT, SUBSTRING (first,  4 ,  1 )) * POWER ( 2 ,  24 )) + (CONVERT (INT, SUBSTRING (first,  3 ,  1 )) * POWER ( 2 ,  16 )) + (CONVERT (INT, SUBSTRING (first,  2 ,  1 )) * POWER ( 2 ,  8 )) + (CONVERT (INT, SUBSTRING (first,  1 ,  1 ))) + dpages