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echo: 4dos
to: Leonard Erickson
from: Jonathan de Boyne Pollard
date: 1998-09-30 10:24:52
subject: DOS backup program w/LFN

KM>> DOS, at least any DOS I know, doesn't support LFNs withgout W95/98

 PK>> Caldera's DR-DOS does, with a special device driver. But that one's
 PK>> rather flaky. 

 LE> Well, since Win95/98 *aren't* OSes (they run on top of DOS, just like
 LE> older versions of Windows, it's just that MS went to a lot of trouble
 LE> to make this non-obvious), the LFN support *is* in the version of DOS
 LE> they use. But just barely.

At the risk of getting too technical for the lurkers, I have to disagree
with this.  Although DOS+Windows 95 and DOS+Windows 98 are, when taken as a
whole, operating systems (albeit quite appallingly bad ones), the long
filename support that they provide does not reside in their DOS portions. 
Long filename support is provided by the replacement INT 21h handlers that
the VMM and VxDs supply to v8086 tasks.  If only the DOS services are
available, i.e. before the VMM and VxDs are run, when the machine is
executing AUTOEXEC.BAT or when one "boots to a command line",
long filename support is unavailable.

 ¯ JdeBP ®

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