You can use embedded Internet Explorer control, hosted by FHP, to show Office documents. But, by default, IE will open them as read-only, even if they are local files. If you are using SharePoint server, you can notice that it opens Office documents as read/write in that case.
So, in order to resolve this behavior so that IE opens documents that are in the Internet or Local intranet security zones with read/write permissions, you must add the following registry key:
• For Office XP
HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Common\Internet\OpenDocumentsReadWriteWhileBrowsing = 1
• For Office 2003
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Common\Internet\OpenDocumentsReadWriteWhileBrowsing = 1
• For the 2007 Office system
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Common\Internet\OpenDocumentsReadWriteWhileBrowsing = 1