Thanks a lot for your help, but I allready done it....

This is the final code, I wonder if you say any comments about it....

if !IsClassRegistered("Excel.Application")
messagebox("Excel is not installed")
else
a="C:\estaib\archivos\abril2006.xls"
b="C:\estaib\archivos\rankingabril2006.xls"
oExcel = createobject("Excel.application")
with oExcel
.Workbooks.Open(a)
.visible = .t.
.ActiveWorkBook.ActiveSheet.Range("E:E").Numberformat = "#,##0"
.ActiveWorkBook.ActiveSheet.Range("F:F").Numberformat = "#,##0.00"
.ActiveWorkBook.ActiveSheet.Range("A1:F1").Font.Bold=.t.
.ActiveWorkBook.ActiveSheet.Range("A1:F65536").Font.Size=10
.ActiveWorkBook.ActiveSheet.Range("A1:F65536").Font.Name='Tahoma'
.ActiveWorkBook.ActiveSheet.Range("A1:F65536").EntireColumn.AutoFit
.ActiveWorkBook.ActiveSheet.Range("A1:F1").HorizontalAlignment = -4108
.ActiveWorkBook.ActiveSheet.Range("A1:F1").VerticalAlignment = -4108
.ActiveWorkbook.Save
.Workbooks.Open(b)
.visible = .t.
.ActiveWorkBook.ActiveSheet.Range("C:C").Numberformat = "#,##0.00"
.ActiveWorkBook.ActiveSheet.Range("D:D").Numberformat = "#,##0"
.ActiveWorkBook.ActiveSheet.Range("A1:F1").Font.Bold=.t.
.ActiveWorkBook.ActiveSheet.Range("A1:F65536").Font.Size=10
.ActiveWorkBook.ActiveSheet.Range("A1:F65536").Font.Name='Tahoma'
.ActiveWorkBook.ActiveSheet.Range("A1:F65536").EntireColumn.AutoFit
.ActiveWorkBook.ActiveSheet.Range("A1:F1").HorizontalAlignment = -4108
.ActiveWorkBook.ActiveSheet.Range("A1:F1").VerticalAlignment = -4108
.ActiveWorkbook.Save
endwith
endif