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OLK Format Specification

File format .OLK/.OLK14
Type Data files
Developed By Microsoft office outlook
Mime-type Application/octet-stream

What do you understand by OLK file format?

OLK file format is known as Outlook Address Book file which was developed by Microsoft. This is used for address book which contains contact in formation for people and organization. OLK14 file format is the original Outlookfile format that the outlook 2011 MAC client used to stores its email message data. OLK file stores organization data, addresses, phone numbers, contact information etc. It is used for loading and saving contacts. It stores temporary copies of email attachment in an OLK folder. The OLK or OLK14 folder is created by outlook to provide temporary storage of the email-attachments such as PDF files, spreadsheet and other documents including copies of confidential files. Oftentimes, these attachments are not there temporarily but remain there definitely until you manually delete them. Outlook creates a separate folder for opening its attachments and is located under TIF; the folder name beginning with OLK. This file format also used by Investigator for analysis and it can be classified under Database files.

OLK Format

Location of OLK files.

Microsoft Outlook Version Location
MS Outlook 2016 HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Security
MS Outlook 2013 HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Security
MS Outlook 2010 HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security
MS Outlook 2007 HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security
MS Outlook 2003 HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security
MS Outlook 2002 HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security
MS Outlook 2000 HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security
MS Outlook 98 HKEY_CURRENT_USER\Software\Microsoft\Office\8.5\Outlook\Security
MS Outlook 97 HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Outlook\Security

List of Application that open OLK and OLK14 format

  • Microsoft Outlook Express
  • Microsoft Word
  • Microsoft Outlook for Mac.

Top 4 steps to Open OLK file

  • STEP1: Select the OLK file, Right click the OLK.
  • STEP2: Now, choose "Open with" option & select default program.
  • STEP3: If default program option not available, then choose the Microsoft words and Microsoft Outlook express.
  • STEP4: Click Ok.

Note: If RAF supported software is not available on your PC, so you need to download from the internet and install it.

Top 4 reasons unable to open OLK files

  • Due to incomplete installation of an application that supports the OLK format.
  • Due to accidental deletion of the description of the OLK file from the windows registry.
  • Due to harmful malware attack, file may be corrupted.
  • Due to insufficient resources to open the OLK files.

OLK 14 file Format

3 Steps to find OLK folder on your systems

  • STEP 1: Click Start, Go to run and enter regedit, then hit enter to start the registry editor.
  • STEP 2: Now, Expand HKEY_CURRENT_USER, then software and so on using the matching entry above for your version of Office before you see the OutlookSecureTempFolder string value. Double click this value and copy its contents to the clipboard.
  • STEP 3: Now, Paste the contents of the clipboard into any explorer window or into the aforementioned open dialog box to go directly to the OLK folder location.


In this article describe the concept OLK and OLK14 file format. It is an outlook file format. OLK format is known as outlook address file which is developed by Microsoft, Also describe the location of OLK database, reasons unable to open OLK file and ways to open OLK file and find OLK file.