On some ISO 9660 discs, there may exist directories that appear to have
additional '.' files and other incorrect entries.  In these few cases,
empty sectors were allocated to directory files in the mastering process.  
According to High Sierra, these are errors, but to ISO 9660 these are 
acceptable.  This will be fixed in a subsequent release.

The following functions exhibit incorrect behavior with 
MSCDEX. These functions will be updated in a future version 
of MSCDEX:

INT 21h Function 23h - Get File Size (FCB and Extended FCB)

     Executing this function with an extended FCB and with only
     the volume label file attribute set always succeeds. This is
     true even if the file does not exist. This deviates from the
     behavior of other drives. This function always succeeds with
     an existing file.

INT 21h Function 4300h - Get File Attributes

     Attempting to find file attributes for the files "\" and "."
     (from the root directory) fail under MSCDEX.

     Getting file attributes for ".." files in first level
     subdirectories do not return the directory attribute under
     MSCDEX.

     Note: The volume label file attribute does not show up when
     testing for file attributes.

INT 21h Function 4Eh and 4Fh - Find First File/Next File

     These functions have the following characteristics on a CD-
     ROM drive:

     1. Executing a find first function and masking for
        only volume label returns the volume label correctly.
        Successive executions of the find next function do not fail
        as they would on other drives.

     2. Executing a find first function and masking the
        volume label and additional flags does not return the volume
        label on the find first function, or on any successive find
        next functions.

     3. Executing a find first function with a file
        specification of a ".." file from a first level subdirectory
        fails even when the file exists.

INT 21h Function 5701h - Setting File Time

     This function never fails (sets carry flag) for a CD-ROM
     drive (even with a non-existing file); it does not set a new
     file time for existing files.

INT 21h Function 3Bh - Set Current Directory

     The function does not fail when setting the directory to the
     directories "\", "." from root directory, or ".." from first
     level subdirectory (although they either do not exist or do
     not have directory attributes).

INT 21h Function 0Fh - Open File (FCB and Extended FCB).

     This function always succeeds with an existing file. This
     function always succeeds when used with an extended FCB and
     with only the volume label file attribute set. It will
     succeed even if the file does not exist.


