_ole_excel = CreateObject("Excel.Application")
_ole_excel.VISIBLE=.T.
_ole_excel.WorkBooks.Open('123.xls')
FOR each ff IN _ole_excel.Worksheets
_ole_excel.Worksheets(ff.name).cells.replace('a','b',1,1,.t.,.t.)
NEXT
_ole_excel = CreateObject("Excel.Application")
_ole_excel.VISIBLE=.T.
_ole_excel.WorkBooks.Open('123.xls')
FOR each ff IN _ole_excel.Worksheets
_ole_excel.Worksheets(ff.name).cells.replace('a','b',1,1,.t.,.t.)
NEXT