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What file extension is associated with Microsoft Outlooks offline file?

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.OST, This file is generated by the application for the purpose of storing the content of the user's mailbox on the local hard drive for offline use. In Office XP and earlier versions, the OST file will become corrupt if its size grows to over 2 gigabytes, generally causing Outlook to freeze up in use or while starting up. Reducing the size of the mailbox and manually deleting the file is the solution for this condition (a new file is created automatically the next time the program is started). Office 2003 features a new format for the file with support for a 20-gigabyte working file size. The "OST" is directly linked to the Microsoft Exchange profile which created the file. there are 3rd party software providers that supply programs to recover orphan OST files

Posted on Aug 19, 2008

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  • Outlook data files (.pst)
  • Offline Folders file (.ost)
  • Personal Address Book (.pab)
  • Offline Address Books (.oab)
  • Command bar and menu customizations (.dat)
  • Navigation Pane settings (.xml)
  • Registered Microsoft Exchange extensions (.dat)
  • Outlook contacts nicknames (.nk2)
  • Rules (.rwz)

Posted on Aug 19, 2008

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Posted on Jan 02, 2017

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The .ink files are shortcuts. If they have no icon, or the same icon then you deleted the programs. Try reinstalling them. If not, don't worry, just launch you application by double clicking the .ink files. If it doesn't work no worries, that's not a biggie and can be easily fixed in a couple of minutes. There are a couple of ways to do it, read both:
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Option 2 (If Option1 fails):

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1 Answer

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1 Answer

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Each Windows Operating System, 98, NT, 2000, XP, Vista and Windows 7 associate files with programs. This means that the file will open with that program each time it is clicked on.
The error indicates that the file type does not have a program associated with it.
1. You do not have the program it is looking for loaded on the system
2. The program is installed but the association is broken

Google can help you with locating the program you need to open the file type you are looking for.
1. Make sure your system is showing you the extension for the file. This is the three letters following the period at the end of the file name. Example MyLetter.doc: doc is the extension.
2. Go to Google and type in a search for that extension. Example:type File extension flv, in a Google search. Notice, no period is used in the search.
3. Look in the results summary for the words Open an flv file (in your case you would substitute your extension)
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It looks like a problem with file associations. The computer maintains a list of file extensions and the programs that will open files with such extensions.

Please go to the link below for details on changing file associations:

http://support.microsoft.com/kb/307859

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