Outlook Error Cannot Open Extend.dat
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/ Tutorials / Find and Delete Extend.dat Last reviewed on May 7, 2014 —5 Comments When you receive and error that Outlook can't find and add-in, the usual cause is that you uninstalled it but Outlook didn't delete the file it uses to keep track of installed add-ins. This file is extend.dat and is found in the (hidden) local app data file under your user account. It's in the same folder as your Outlook data files. You can quickly jump to it by typing or pasting the following command in the Start http://answers.microsoft.com/en-us/msoffice/forum/msoffice_install-mso_other/opening-outlook-2007-error-message-referring-to/7ad2d09d-cd27-4d7f-bde5-00ccb011c980 Search field in Windows 7 or Vista. %localappdata%\microsoft\outlook Delete it and restart Outlook. Outlook will rebuild the extend.dat field and the errors should go away. In most cases, you'll need to restart Outlook for any changes to take effect. Tip: when you use these commands to open hidden files and folders, you can see the contents of the folder without changing your http://www.slipstick.com/tutorial/find-delete-extenddat/ settings for Hidden files and folders. Windows XP Location If you are using Windows XP, extend.dat (and the data files) are at %USERPROFILE%\Local Settings\Application Data\Microsoft\Outlook Type or paste it into the Start menu, run command (you can also use Windows key + R to open the run command) and press Enter. Open the Add-ins Dialog To view the installed add-ins, go to Outlook 2007's Tools menu and select Trust Center, then Add-ins. In Outlook 2010, you'll go to File, Options, Add-ins. The list of installed (and the active or disabled state) is on this screen. Click Go at the bottom of the screen to open the dialog which will allow you to enabled or disable the add-ins. In older versions of Outlook, go to Tools, Options, Other, Advanced options, Add-in Manager and COM Add-ins. Delete Extend.dat Video Tutorial MoreInformation For more information on shortcuts to the file locations, see Where Are My Files? (Outlook-tips.net) For more information on the files Outlook uses and which need backed up, see Outlook 2007 Backup and File Locations
Click to share on Twitter (Opens in new windoGuest When I open Outlook 2003 I get an error message saying: An extension filr failed to initialize. Can't open the file: extend.dat. It also says the file may not exist. How do http://www.pcreview.co.uk/threads/i-am-getting-a-extend-dat-error-when-i-open-outlook-why.865417/ I correct this problem? Guest, Mar 24, 2005 #1 Advertisements neo [mvp outlook] Guest Might want to check this location under Windows 2000/XP. \Documents and Settings\