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Error Opening excel spreadsheet

I maintain an application written is classic ASP. We are getting the following error when trying to open any of the xlsx files: "Excel cannot open the file 'FileName.xlsx' because the file format or file extension is not valid. Verify that the file has not been corrupted and the file extension matches the format of the file." I do not have a problem creating the file and saving the xlsx on the machine. Open the xlsx is the problem. The organization update the Microsoft 365.

I am using the code below to create the xlsx:

Response.Buffer = TRUE
Response.ContentType = "application/vnd.ms-excel"
''''attachment = open a file save dialog
Response.AddHeader "Content-Disposition", "attachment; filename=" & txtReportName & ".xlsx"

Thank you for your help.
Apr 6 '23 #1
1 27795
This seems to read write permission issue. You can hire classic asp developer with us.

https://www.expertfromindia.com/hire...rogrammer.html
Jan 5 '24 #2

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