Filename.xls is in a different format than specified by the file extension

Question

When I create Dimensions and then try to maintain dimension members using the administration client, I receive the following notification from Excel 2007.  The file you are trying to open, filename.xls, is in a different format that specified by the file extension.  Verify that the file is not corrupted and is from a trusted source before opening the file.  Do you want to open the file now?  Yes or No.
I click yes and the file opens correctly in Excel.  If I click No, I get an "Unspecified error" dialog box from BPC.  I suspect this is a security feature in Excel 2007.  Has anyone else run across this and if so, know of a good way to disable this message?
Adam

Answer 1

After upgrading to Excel 2007, you may get the following error when you try to open an excel document.
The file you are trying to open .xlsx is in a different format than specified by the file extension. verify the file is not corrupted and is from trusted source before opening the file. Do you want to open the file now?
This errors particularly occurs when youu2019re trying to open an XLS file (Excel 2000-2003) with Excel 2007.
The easiest way to solve this problem, is to insert the following registry key. This will suppress the notification:
[HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security]
u201CExtensionHardeningu201D=dword:00000000
The step-by-step instructions are as follows:
1.Click Start, click Run, type regedit.exe and press ENTER. This will open your Registry
2.Navigate to HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\OFFICE\12.0\EXCEL\SECURITY
3.Right click in the right window and choose New -> DWORD
4.In the Name field, type u201CExtensionHardeningu201C  (without the quotes)
5.Verify that the data has the value u201C0u2033
I advice the steps above to solve the problem, despite the fact that it is quick and dirty.