Hope if you have Windows 7 dbf files on your computer this guide can help you fix the problem.
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The file with the extension .DBF can be accessed from most of the database files used by the dBASE data management system. The data is only stored in a file in a table with multiple records and even fields.
Because the file structure is very simple and this format was used in the early days of database programs, it is considered a widely used format for structured data.
Esri ArcInfo data in .DBF files is also known as the attribute shapefile format. These records use the dBASE format for shape vendor attributes.
FoxPro table files specially created by Microsoft using Visual FoxPro also include files with this extension.