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dfIsDBF()
Tests if a file is a database file
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Syntax:

     dfIsDBF( <cFile> ) --> lDbf

Parameters:

     <cFile>    File to test.

Returns:

     <lDbf> Is .T. if the file is a database file.

Description:

     Tests if a file is a database file. The test consists in verifying the
     DBF extension, and verifying the first byte of the file, which must be
     03h (if there isn't a DBT file) or 83h (if there is a DBT file).

Example:

     IF dfIsDBF( "Clients.dbf" )    // test
        USE clients NEW             // open
        // ddUse( "Clients" )       // alternative open
     ELSE
        dbMsgErr("File Corrupted") //  error
     END

See also:

     ddGenDbf(), ddUse()