Excel 03 file will not open in Excel 2007

All,
Latley we have been having problems with excel files. We are getting .xls files via e-mail and some users who have Office 2007 Standard on an XP Pro PC try to open the file and get the following message:
The file you are trying to open, 'filename.xls' , is in a different format than specified by the file extension. verify the file is not corrupt and is from a trusted source before opening the file. Do you want to open the file now? "Yes, No or Help". If you click on "Yes, it opens excel but the workbook is blank. If you click "no", it closes. and "help" was of no help at all.
However if a user who has Vista Business and Office 2007 standard, they can open the file. Then they save the file and send it back to the user who has the problems and they can then open it.
If you save the file to a local drive or network drive, it is blank "0 KB". I searched the internet and only found how to stop the "yes, no, help" popup.
We use Excahnge 2003 internally.

Any ideas why this is happening?
LVL 1
DarrylRTAsked:
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DarrylRTConnect With a Mentor Author Commented:
I have updated the Symantec Endpoint to 11.0.3001.2224. Then I added the check to the "enable microsoft outlook Auto-Protect". The users were able to open the file with no issues. Now the problem has gone away. Thank you to all who offered there suggestions.  
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ExcelGuideConsultantCommented:
try the to insert this key in your registry to suppress the notification:

[HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security]
ExtensionHardening=dword:00000000

You can accomplish the above by doing the following:

Open your Registry (Start -> Run -> regedit.exe)
Navigate to HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\OFFICE\12.0\EXCEL\SECURITY
Right click in the right window and choose New -> DWORD
Type ExtensionHardening as the name (without the quotes)
Verify that the data has the value 03

good luck
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tyro7866Commented:
Download Microsoft Office Compatibility Pack for Word, Excel and PowerPoint 2007 at Microsoft website.

http://www.microsoft.com/downloads/details.aspx?FamilyID=941b3470-3ae9-4aee-8f43-c6bb74cd1466&displaylang=en

you will be ok
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tyro7866Commented:
or try this freeware

http://www.nativewinds.montana.com/software/docx2rtf.html#download 

convertd doc to docx to doc or the opposite.

good luck.
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DarrylRTAuthor Commented:
Psychotec, I have tried your soultion, but it only bypasses the popup, and still opens blank.

Tyro7866, Your suggestions are for users running older office (2003) trying to open a 2007 file. My users are running 2007 office and need to open a file that is from 2003 office. However I installed the compatability pack anyway to see if it would solve the problem and it did not.

Thank you for your suggestions!
Darryl
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DarrylRTAuthor Commented:
The problem is with Outlooko 2007. An e-mail with an Excel attachment that is sent to a user can not be opened. I does not matter if the e-mail is in the inbox, sent items or deleted items. However if the user clicks on Forward and then doubleclicks on the file, it will open. Anyone have a thought?
Thank you,
Darryl
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DarrylRTAuthor Commented:
increades point value to 500. This is happening on more PC's now. Even with a fresh install.
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GlennaShawCommented:
Have you installed SP1?  And try installing the compatibility pack anyway.  It won't hurt and I think it's supposed to automatically install with 2007.
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DarrylRTAuthor Commented:
GlennaShaw,
I have verified that SP1 is installed and I installed the Compatibility pack as well. This did not change anything. Excel opens with a blank page.

Darryl
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GlennaShawCommented:
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DarrylRTAuthor Commented:
GlennaShaw,
I have gone over that artical twice now and did everything in it. Still no luck. If you try to preiew the file it does not open as well.
Darryl
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GlennaShawCommented:
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DarrylRTAuthor Commented:
It seems that Symantec endpoint 11.0.2010.25 is the problem. If I disable the program, the problem goes away. If I enable it again it comes back. I called Symantec about this and they are aware of this issue. They do not yet have a fix for it (as of today). They do hope to have a fix by the end of the year (as per the tech on the phone). The upgrade will be 11.0.4000. Until then the only solutions are to:
1. click on Forward (do not click on send) and then doubleclicks on the file, it will open.
2. in Symantec Endpoint, Change settings, Configure settings (for Antivirus and Antispyware Protection), outlook auto-Protect, Uncheck "enable microsoft outlook Auto-Protect".
Thank you all for your suggestions and comments.
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GlennaShawCommented:
Please accept your finding as the correct answer so folks who are searching here can find it.  And thanks for sharing!
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DarrylRTAuthor Commented:
GlennaShaw,
I have accepted my post as the solution. I have done so twice.
 
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