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FILEATTR returns information about an open file or ISAM table, such as the
DOS file handle and whether the file was opened for input, output, random,
append, or ISAM binary mode.
 
FILEATTR(filenumber%,attribute%)
    ■ The argument filenumber% is the number used in the OPEN statement to
      open the file or table. You can use a numeric expression as long as
      BASIC evaluates it to the number of an open file, device, or table.
    ■ The arguments attribute% and value& are described on the Syntax screen.