Hi, I've a very strange problem with some kind Office attachment in OWA 2003. When i try to download from WOA and e-mail with attachment with xlsx extension from IExplorer 8 it download the file with the extension.XLTX. I've disable the option in IE "open files based on the content" and I have added in IIS the Office 2010 MIME Types correctly. It just happend with XSLX extensions and with IExplorer, docx download fine, using Firefox works perfect, but I need made it work in IExplorer 8. Could you help me Thanks.

Are you using Windos 7 for iexplorer 8. Have a look of below thread. http://social.technet.microsoft.com/Forums/en-US/exchangesvrmigration/thread/6f5c0011-114b-409d-8c75-186dc66fdea2/ Anil

Thanks a lot for the link Anil. I find out a workaround for the problem. Deleting the registry entry: [HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/vnd.openxmlformats-officedocument.spreadsheetml.template] "Extension"=".xltx" Solve the problem. Thanks for your help.

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Hi, Now the issue is IE8 client can’t open the attachment of .xlsx file, because they changed into .xltx file via OWA. As a workaround, I think you may install Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint File Formats. You could download it from here: http://www.microsoft.com/downloads/en/details.aspx?displaylang=en&FamilyID=941b3470-3ae9-4aee-8f43-c6bb74cd1466 If it worked, You could use Group Policy to install the pack for all IE8 client.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, Now the issue is IE8 client can’t open the attachment of .xlsx file, because they changed into .xltx file via OWA. As a workaround, I think you may install Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint File Formats. You could download it from here: http://www.microsoft.com/downloads/en/details.aspx?displaylang=en&FamilyID=941b3470-3ae9-4aee-8f43-c6bb74cd1466 Hi, Thanks for the link. All my clients have Office 2010 installed.