Further information about the pst-file can be found here. Corruption of the main pst-file can prevent Outlook from loading correctly and could also lead to data loss. Therefore you should backup these files on a regular basis. These files were originally used only to cache an Exchange mailbox but the Outlook Connector also uses this file format to cache Live Hotmail mailboxes.
By default the file is called outlook. Additional automatically created ost-files are appended with a number e. When it gets corrupted it an prevent Outlook from loading correctly but as long as you still have access to the Exchange server you can recover by renaming it to. Upon deletion or renaming it will be automatically recreated when you connect to the mail server again.
It may also be used by other connector type accounts. Older versions of the Outlook Connector for instance also have used this file format. It consist out of 6 files all containing different information or indexes about the users in the corporate global address book GAL.
Similar to the ost-file it is designed for offline usage, reducing network traffic and optimizing responsiveness when working on a slow connection. You should make a backup of these files and you can also migrate them for use on another computer. They are similar to computer shortcuts lnk-files which point to other files on the computer. Since Outlook the file format is no longer registered for direct execution but that can be enabled again. You can migrate these files to another computer or even share them when they link to a Public Folder for instance but of course that location should also be available on the other computer.
This feature was added in Outlook Since Outlook you can only directly import pab-files into your Contacts folder. If you still use pab-files for some reason, you should either back it up or import them into the Contacts folder and stop using them completely.
You can still create a backup of your rules in the rwz-format and import them. There are up to 19 qat-files for Outlook For an overview of their naming and which type of window they apply to see this post. There are up to 20 qat-files for Outlook , Outlook and Outlook Any attachments that the message holds are also contained within this file. This allows you to open individual items on another computer on which Outlook is installed.
In case of the signatures, additional files and folders can be created in the signatures folder to save formatting information or pictures which have been used in the signature. For more about signatures see this guide. When saving a message in this format, attachments will not be saved with it.
This file is automatically created or recreated when missing upon starting Outlook. The default first project is stored in a file vbaproject. If you have any macros configured, it is highly recommended to make a backup of this file or document your code elsewhere. You can also migrate these files to another computer. Possible Location: Roaming Profile Settings outcmd. You can make a backup of this file for local use but due to dependencies of installed addins, it is not recommended to migrate this file between computers.
It is worth a shot to try it though as in case you run into issues, you simply rename the file to outcmd. Not recommended Location: Roaming Profile Settings extend. When it is corrupted, it can prevent Outlook from loading correctly. There is no need to make a backup of this file. Upon deletion it is automatically recreated from registry information. Not needed Local: Local Profile Settings views.
Not possible Location: Roaming Profile Settings frmcache. If it gets corrupted, custom forms might prevent from loading, display older versions of the form or my cause other unexpected results.
Recovering can be achieved by clearing the folder which can be done in several ways. When you use Word as your email editor, in Outlook or previous, then this file gets loaded as well. If the normal. Resetting the normal. This file should be backed up if you made custom changes and the file can be migrated between machines although certain addin dependencies can prevent it from working correctly. Possible Location: Templates NormalEmail. Quick Parts information is also stored in this file.
This file should be backed up if you made custom changes and the file can be migrated between machines. Possible Location: Templates custom. Since Outlook it is stored in the Unicode format and its location changed from the Proof folder to the UProof folder. This is a shared file between other Office applications. The file can be edited via the spell check options in the Office applications that use it or directly via Notepad.
The is replace with the localized language ID number for the language it applies to. For instance, the English version is named MSO If the addin didn't exist, deleting extend. Schedule Management. Calendar Printing Tools. Calendar Reminder Tools. Time and Billing Tools. Meeting Productivity Tools. Duplicate Remover Tools. Sending and Retrieval Tools. Mass Mail Tools.
Compose Tools. Mail Tools for Outlook. Online Services. Productivity Tools. Automatic Message Processing Tools. Special Function Automatic Processing Tools. Housekeeping and Message Management. Project and Business Management Tools. Run Rules on messages after reading.
Outlook Suggestion Box UserVoice. All rights reserved. Slipstick Systems is not affiliated with Microsoft Corporation. Sign up for Exchange Messaging Outlook. Replace the dat extension with your file's extension in the file's current name. Method 3. Consider the context of the file. You may be able to figure out which program you're supposed to use to open the file based on where the file is stored or what the file is named.
If the file is inside of a folder that contains other system files for your computer, it's probably best to leave the DAT file alone—it's probably used by your computer's built-in programs or features.
Ask the file's creator. If you received the DAT file as an email message or from a download site, try contacting the person who sent or uploaded the DAT file and asking what program they used to create the file. This is unlikely to yield much if you're asking on a crowded forum or a file-sharing site, but you should be able to get an answer out of a coworker or a friend via email.
Open the DAT file in a text editor. You may be able to use your computer's built-in text editor to view some or all of the DAT file's contents: Windows — Open Notepad, then drag-and-drop the DAT file into the Notepad window. Look for information about the DAT file. Depending on the DAT file, you may be able to see a line or two of text that determines the type of software used to open the file.
Even if you don't see a line about the specific program you need to use, you might find a line that indicates the type of file e. Try opening the DAT file in a general program. Use trial-and-error. Unfortunately, if you haven't been able to determine the DAT file's origin program by this point, you'll have to start attempting to open the DAT file with different programs on your computer.
You can do this by opening a program, dragging the DAT file onto the program's window, dropping it there, and waiting for the file to open. If the file opens in a recognizable format, you've found the correct program. If the program displays the DAT file as an incomprehensible jumble of characters or refuses to open the file, your selected program isn't the right program.
Did you know you can get expert answers for this article? Unlock expert answers by supporting wikiHow. Yaffet Meshesha Computer Specialist. Yaffet Meshesha. Support wikiHow by unlocking this expert answer. Not Helpful 2 Helpful 0. Include your email address to get a message when this question is answered. DAT files found in system folders e. Helpful 0 Not Helpful 0. This makes it useful for figuring out DAT file associations.
If the program with which the DAT file was created isn't compatible with your computer, you'll need to use a different computer to open the DAT file.
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