Outlook Extend Dat Error
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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 http://answers.microsoft.com/en-us/msoffice/forum/msoffice_install-mso_other/opening-outlook-2007-error-message-referring-to/7ad2d09d-cd27-4d7f-bde5-00ccb011c980 it by typing or pasting the following command in the Start 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 http://www.slipstick.com/tutorial/find-delete-extenddat/ open hidden files and folders, you can see the contents of the folder without changing your 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 A
can I find these and what do they do? The most common dat-files that can be reset for troubleshooting are outcmd.dat and extend.dat. To reset them you can browse to their https://www.msoutlook.info/question/19 location and rename them to .old when Outlook is closed. Note: Outlook 2010 and Outlook 2013 no longer use the the extend.dat and outcmd.dat files. outcmd.dat Keeps toolbar customizations. Resetting this will restore the Toolbar to default and recreates the icons that some add-ins might have installed. Windows XP C:\Documents and Settings\%username%\Application Data\Microsoft\Outlook\ Windows Vista, Windows 7 and Windows 8C:\Users\%username%\AppData\Roaming\Microsoft\Outlook\ extend.dat Keeps a registry cache outlook 2003 of installed Exchange Client Extensions (ECE) add-ins and their status. Resetting this will force Outlook to retrieve the settings from the registry again and reset their status. Windows XP C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\Outlook\ Windows Vista, Windows 7 and Windows 8C:\Users\%username%\AppData\Local\Microsoft\Outlook\ You can paste the paths mentioned above in the Address Bar of Explorer to quickly open the location. Note 1: To easily locate the folders an extension failed for you, you can also use OutlookTools (free!) Note 2: For an overview of the locations of other Outlook files and settings see Files and Settings guide for Outlook. Related Content Starting clean or resetting parts of Outlook Backing up Outlook Data QAT and Ribbon settings not saved upon logoff Don't repair ost-files with scanpst.exe Change default location for pst and ost files Related Categories: Background info • Configuring • Errors Use "BH93RF24" to get a discount when ordering! ◀◀ Previous Tip Next Tip ▶▶ ▶ Quick Tip Index ◀ NavigationHome Random Q&A Find Add-ins Books Quick Tip Index Tip Top 20 About Tool Tip Categories Accounts Addins Attachments Background info Calendar Categories Configuring Contacts Errors Exchange Images Import/Export Installing Interface Journal Mail Composing Mail Organizing Mail Reading Notes OneDrive Outlook Outlook.com / Hotmail OWA Printing Registry RSS Rules Search Security Tasks To-Do Bar Uncategorized Views Tool Tip Awards Subscribe & Share Popular TipsOutlook can’t send after upgrading to Windows 10 Setting the Sent Items folder for IMAP accounts in Outlook 2013 Inbox Repair Tool (scanpst.exe) Do not automatically mark as read Links do not open: This operation has been cancelled due to restrict