Files that contain the .lck file extension are locked files that have been created by a variety of database software applications.
When a user has a shared database file open on his or her computer and another user tries to open that file, a LCK file will be automatically created. This file allows the second user to view the contents of the database but prevents them from making any changes. This prevents information in the database file from being accidentally overwritten or deleted.
One the user has closed the LCK file, the file is normally deleted automatically by the software application.
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