Classic ASP, Microsoft Excel 2007

Posted on 2011-03-03
Medium Priority
Last Modified: 2012-05-11
Hi, I am writing a script to export data to an excel file which works
fine but it gives me warning:

"The file you are trying to open, 'ABC.xls', is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening. Do you want to open file now?"

If I use the extension .xlsx, the file will get created, but Excel won't let me
open it. I get an error:
"Excel cannot open the file "ABC.xlsx"
because the file format or file extension is not valid. Verify that
the file has not been corrupted and that the file extension matches
the format of the file".

With .xls, I can open file with warning and with .xlsx, I can't open the file.
It'll be really helpful if you help me get rid of that warning.

I am using classic ASP and Microsoft Office 2007.

Thank you.

Question by:pawar_deepak
LVL 29

Expert Comment

ID: 35031517
I *think* you can find a solution from this link:


Please let me know if none of the solutions help you.

Expert Comment

ID: 35041012

It is not clear to me if you are getting this error when script tries open the file or or when you are trying to open an Excel file created by script?

without seen what your script is doing it is difficult to say, but, apparenty, your script assumes a wrong file formats/types. XLS extension is used for 97-2003 workbboks versions.

For 2007+ version they have several types for this: XLSX is for no-macro workbooks (which are, in reality, a XML text file compressed with ZIP), XLSM is a macro-enabled workbook and XLSB is a binary file, most similar to XLS.

Most likely, your file should has XLSM extension, and the Excel warns you that you are opening a file, which may be hazardous. Try using XLSM extension and add the file location to Trusted Sources.
LVL 14

Accepted Solution

Zack Barresse earned 2000 total points
ID: 35053916
When you create the file, are you using the new file format extensions?  Take a look at Ron de Bruin's site for examples on saving 2007+ files...


Train for your Pen Testing Engineer Certification

Enroll today in this bundle of courses to gain experience in the logistics of pen testing, Linux fundamentals, vulnerability assessments, detecting live systems, and more! This series, valued at $3,000, is free for Premium members, Team Accounts, and Qualified Experts.

LVL 14

Expert Comment

by:Zack Barresse
ID: 35318053
It seems it's another file format issue, which should be resolved if they specify the particular file format in their code.  The link to Ron de Bruin's site has it well documented, and should have worked for them.  I don't care about the points, but I disagree that it should be deleted as I've provided the solution.

LVL 29

Expert Comment

ID: 35318823
I too could care less about the points but what gets me with the recommendation is that the poster never actually responded to any of the solutions posted.

So, I am not real sure why the decision to delete.

Either way, refund him his points but please encourage them to respond to solutions so we know whether or not the solutions we suggest has helped them or not.

Expert Comment

ID: 35357068
Starting auto-close process to implement the recommendations of the participating Expert(s).
EE Admin

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Windows Explorer let you handle zip folders nearly as any other folder: Copy, move, change, and delete, etc. In VBA you can also handle normal files and folders, but zip folders takes a little more - and that you'll find here.
I tried to use the SharePoint app to Import a Spreadsheet and import an Excel sheet into a Team site made in SharePoint 2016. But that just resulted in getting an error message 'Unknown Error'...
The viewer will learn how to create two correlated normally distributed random variables in Excel, use a normal distribution to simulate the return on different levels of investment in each of the two funds over a period of ten years, and, create a …
This Micro Tutorial will demonstrate in Microsoft Excel how to add style and sexy appeal to horizontal bar charts.

627 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question