The .ldf file extension is most commonly used by Microsoft SQL servers. The LDF files contain a server log file that records a list of server events. These files are automatically created and updated by the associated server application.
The .ldf file extension is also used for IBM Works for OS/2 data filer form files, Geoworks library definition files, LuraDocument image format files, ProWORX Nxt logic data files and Mincom LinkOne files.
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If you have additional information about the LDF file format or software that uses files with the LDF suffix, please do get in touch - we would love hearing from you.