Important Notice

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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     If your program is going to use a record size other than 128
     bytes, it should set the record size field at FCB offset 0Eh after
     the file is successfully opened and before any other disk
     operation.
 
     If random access is to be performed, the calling program must also
     set the FCB relative-record field (offset 21h) after successfully
     opening the file.
 
     For format of directory time and date, see Int 21h Function 57h.
 
     Int 21h Function 3Dh, which allows full access to the hierarchical
     directory structure, should be used instead of this function.
 
     [Version 3.0+]
     If the program is running on a network, the file is opened for
     read/write access in compatibility sharing mode.
                                    -♦-