report export to MS excel

You canwrite to an excel file from WinCC, just like you do from any application that supports VB scripting

[code]Dim objExcelApp
Dim objWorkSheet
Dim objTag
'---------------------
Set objExcelApp = CreateObject("Excel.Application")
objExcelApp.Visible = True 'Set False if you do not want to see Excel opening
'ExcelExample.xls is to create before executing this procedure.
'Replace <path> with the real path of the file ExcelExample.xls.
objExcelApp.Workbooks.Open "<path>\ExcelExample.xls"
set objWorkSheet = objExcelApp.Activeworkbook.Worksheets(1)
'-------------------
'Read data from WinCC tag and write to excel
Set objTag = HMIRuntime.Tags("Tag1")
objTag.Read
objWorkSheet.Cells(4,3).Value = objTag.Value
'-------------------
'Close Excel and reset all objects
objExcelApp.ActiveWorkbook.Save
objExcelApp.Workbooks.Close
objExcelApp.Quit
Set objTag = Nothing
Set objWorkSheet= Nothing
Set objExcelApp = Nothing[/code]

This would create an Excel file with the current date as the name.
[code]
Dim dtmDate, objExcel, objWorkbook, path

dtmDate = Date
path = "C:\Example" & dtmDate & ".xls"
Set objExcel = CreateObject("Excel.Application")
objExcel.Visible = false
Set objWorkbook = objExcel.Workbooks.Add()
objWorkbook.SaveAs(path)
objExcel.Quit

Set objExcel = Nothing
SetobjWorkbook = Nothing
[/code]
You should check wether the file already exists and if not, make it create a new one with the date as name (like above). If it does exist, you should open the file and work in it.