Cannot preview Excel attachments

I have a user who has a problem which has only just developed. The system is Windows Vista with Office 2007 Professional - both the OS and Office are fully up to date with Service Packs and all other updates.

Since earlier this week, when he double-clicks on any Excel attachment in Outlook, he receives an error saing "Microsoft Office Excel Previewer Error"

The only way he can view the attachments is to save them and open them in Excel.

Any ideas please?
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Chris MillardAsked:
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apinetCommented:
Make sure you have the correct default app to open excel documents.

http://windows.microsoft.com/en-US/windows-vista/Change-which-programs-Windows-uses-by-default 

Also clear out your outlook cache.  Find the location in the registry.  HKCU\Software\Microsoft\Office\12.0\Outlook\Security   The key is OutlookSecureTempFolder.  Copy that key information into start search and delete all the items in that folder.
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sibisteanuCommented:
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James ClintonSenior System Support EngineerCommented:
When I last saw this it was a few years back and to do with the prefetch area of windows that is called by outlook to know which app to use to open attachments

if excel is not in there or the prefetch entry has become corrupted then you will not be able to open them inside of outlook

I can only assume this system is still in use by MS at present
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Chris MillardAuthor Commented:
sibisteanu I have seen this MS article already - what concerns me is that the article is nearly 3 years old - surely the issue from this particular KB must have been fixed with an update or service pack!
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sibisteanuCommented:
The problem is with preview of the file in outlook or is an error when you try to open the file with double clicks.
If it is the second – check file associations .
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Chris MillardAuthor Commented:
I fianlly got to have another look at this yesterday. The problem actually arose from the fact that the folder where Outlook stores its temporary files when double clicking attachments was full!

I deleted all items out of this temporary folder, and since doing so, Excel attachments have opened properly.
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apinetCommented:
RoyBridge I posted to clear the temp folder in my original post.
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apinetCommented:
I originally posted the solution.
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Chris MillardAuthor Commented:
Sorry - I actually missed your post somehow
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