saving to excel

I use the following vb code to save data in an msflexgrid to an excel file,together with a common dialogue box, cdsave to select the excel file to save to. However i seem to encounter two dialogue boxes, one from the cdsave dialogue box i created and the other an unknown dialogue box. The second dialogue box comes together with this message: "A file named "resume.xlw" already exists in this location.Do u want to replace it?"

How do I remove this second dialogue box together with its message?

My code is as follows:
private Sub mnufilesaveData_Click()
Call frmchoice.Show(vbModal, me)

Dim obExcelApp as Object
Dim obworksheet as Object
Dim blnrunning as Boolean
Dim intCtr as Integer
Dim intcell as Integer
Dim teststring as string
Dim intFnum as Integer

If (filetype = 1) then

'cdsave.filter = "excel(*.xls)|*.xls"
'cdsave.ShowSave

on error resume next

set obExcelApp = GetObject(, "Excel.application")
If Err.Number <> 0 then

set obExcelApp = CreateObject("Excel.application")
blnrunning = false

else
blnrunning = true
End If

obExcelApp.Workbooks.Add

set obworksheet = obExcelApp.ActiveSheet

'Enter values in active sheet's cells

obworksheet.cells(1, 1).value = "Location"
obworksheet.cells(1, 2).value = " Max Received signals"
obworksheet.cells(1, 4).value = "Received signals"
obworksheet.cells(1, 6).value = " Min Received signals"
obworksheet.cells(1, 8).value = "Simulated signals"

obworksheet.cells(1, 2).WordWrap true
obworksheet.cells(1, 4).WordWrap true
obworksheet.cells(1, 6).WordWrap true
obworksheet.cells(1, 8).WordWrap true

for intCtr = 0 to num_of_locations

intcell = intCtr + 2
obworksheet.cells(intcell, 1).value = Generated.strlocation(intCtr)
obworksheet.cells(intcell, 2).value = Generated.dblMaxPower(intCtr)
obworksheet.cells(intcell, 4).value = Generated.dblMeanPower(intCtr)
obworksheet.cells(intcell, 6).value = Generated.dblMinPower(intCtr)
obworksheet.cells(intcell, 8).value = dblStr_received(intCtr)

next intCtr

'obExcelApp.DisplayAlerts = false
obExcelApp.Save

obExcelApp.ActiveWorkbook.Close false

If Not (blnrunning) then
obExcelApp.Quit
End If

I would also like to have the option of either writing to a text file or excel file. Currently I call up another form for the user to select. Is there any other way to do the selection using the cdsave common dialogue box?