File Extension LCK

  • Full name
    Lock Format
  • Developer
  • Popularity
Have you encountered a problem with a LCK file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a LCK file here. In the further part of this page we have added a list of programs that should open your LCK file. It is enough you choose a proper application for your operating system, download and install it.


The file extension LCK is used by various programs for so-called Program Lock files. These files are used to restrict access to other files, such as a database, to one user at a time. Usually, this file will be automatically opened with the appropriate protected file, and then it will be locked so that if another user attempts to open the protected file, it will be denied.

Programs that use LCK files include Microsoft SharePoint Designer, Corel Paradox, Pegasus Mail, and Skype.

Of course these files are not compatible with each other and should neither be opened nor moved from their directory or deleted.

Programs which can open a LCK file

How to open a LCK file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the LCK file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a LCK file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support LCK files. At this point we are looking for disk space where the application was installed in and we can link it with a LCK file. Since then, our operating system will use the selected program to support all LCK files.

Other issues

Despite the described problem with LCK there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the LCK file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the LCK file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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