Software

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Attempt recovery only on a *copy* of the damaged file.

Can you be more specific about the database "corruption"? Does A4 just fail to open the bare .DBF file? Or does it open, but then shows gibberish in some of the records? Are the data "skewed" so that field data seems to spill over into an adjacent field? Does corrupt .DBF file be successfully and accurately copied to another disk or directory?

There are numerous utilities around that can automatically repair .DBF files, but you can still do some header repairs manually with a hex editor. In my experience, more often than not, the .DBF header gets corrupt, while most of the data are intact.

In one application that I used to maintain (not an A4 application, but one that also used a .DBF file), its favorite way of corrupting the database was to fail to save a valid record count in the header, making the database appear empty. Correcting the record count easily repaired this kind of database damage.

Alternative ways/resources...

https://social.technet.microsoft.com/Forums/en-US/37d68c03-c601-4cdb-bc26-ff3d920a2ec6/open-the-contents-of-a-damaged-dbf?forum=w7itproappcompat - the same issue like yours, but more opinions and solutions for corrupted .dbf file
https://dbf.recoverytoolbox.com (Recovery Toolbox for DBF) - restoration .dbf files of the most popular applications like dBase IV, Clipper, Foxpro, Visual Foxpro and etc.