This issue seems to hit me most when trying to an Excel 2007 workbook that uses conditional formats or colours (colors) back into the Excel 2003 file format.
The add-in attached gets half way to accomplishing the job. I knocked this up very quickly, so it can almost certainly be improved. If anyone wants to give it a go, I'd happily host an updated version and give you credit.
Now, I said I'd got half way..
The attached add-in will disable the compatibility checker on all .xls files that you attempt to save. What it won't catch is new files that have not been saved as Excel workbooks yet. So if you create a brand new workbook and hit save, you'll see the interface like the following:
Save it again immediately, and you won't get the message any more.
Please note that this add-in has received very limited testing. Comments and suggestions for improvement are welcome, just leave a comment here!
To install it:
- Download the file
- Unzip the file and save the addin on your computer
- Go to Office Menu-->Excel Options-->Add-ins-->Go-->Browse
- Navigate to the file and select it
- Make sure the box is checked next to "Disable Compatibility Checker" and click OK