advr.hlp (Topic list)
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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
FILEATTR Function Details
  Summary  Details  Example                Contents  Index  Back
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 FILEATTR(filenumber%,attribute%)
 
 Usage Notes
   ■ The argument filenumber% is the number used in the OPEN statement to
     open the file. You can use a numeric expression as long as Visual Basic
     evaluates it to the number of an open file or device.