doc iconLdb is an extension of Microsoft Access Database lock file. It can be used by Microsoft Access.

It is a database management tool that can be installed with Microsoft Access Office package. 

When you open a database via Access, they lock the files for the purpose of saving a file. Or they aim to allow only one person who is able to edit files. In the mean time a file with LDB extension is formed in the same folder with database.

You don`t need to open this file. When Access is shut down it erases this file automatically. 
You can find different softwares that are able to run Database.

What to use ldb

Microsoft Access

which page related to ldb file

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