What is a laccdb file and how do I open a laccdb file?
An LACCDB is a lock file created by Access 2007. It contains database locks that prevent overwrites or deletions with multiple concurrent users. Access 2007 automatically creates LACCDB files when ACCDB files are opened. These files have the same name as their corresponding ACCDB file and located in the same directory.
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How to open laccdb file on Wikipedia
How to open laccdb file on Microsoft.com