Using VBA to update spreadhseet

This is a followup to another question I posted on EE.  I have already given the max points on that one so I am following up with another question.Please see
https://www.experts-exchange.com/questions/25632353/ExportCheckbox-to-Excel-Spreadsheet.html?anchorAnswerId=29786103#a29786103 
to get the background on this one.

I have VBA code that creates a spreadsheet from within MS Access.  I then have code contributed by and EE member to alter some attributes in the spreadsheet.  The make the EE code compile I added a reference to MS Excel 11.0 Object library to the MDB.  

The sequence of events in my code is to

1. Create the spreadsheet with the statement:

DoCmd.OutputTo acOutputQuery, "qryMortgageExportOutput", acFormatXLS, wkFileName, False

2. Using the logic from 'GrahamMandeno' I revise the spreadsheet to have the checkboxes using the statement:

wkReturn = ExcelCreateColumnCheckboxes(wkFileName, "Confirm Payment", 1)

What is occuring in production, that didn't occur in test, is that I am getting the message "xxxxxxx is an MS Excel 5.0/95 Workbook.  Do you want to overwrite it with the latest Excel format? Yes, No, Cancel.

It is easy enough to answer this question but in reality these spreadsheets are going to be created in bunches, so the user will have to answer the question many times.  Is there any way to suppress the message and have the system automatically answer "yes' each time?

Or, is there any way to keep the condition causing the message from occuring?  Why are the spreadsheets being created in Excel 5.0/95 format.  I didn't get the message when I was running the 'checkbox' logic on an existing spreadsheet as opposed ot one that was created in the same code stream.