According to several sources, space _is_ invalid in MS- and IBM-DOS at
least. (IBM DOS Technical Reference, page 2-4; Using IBM DOS 4.0, page 23;
Microsoft MS-DOS 4.0 Users Guide and Reference, pages 16 thru 17;
Microsoft MS-DOS 5.0 Users Guide and Reference, pages 69 through 70) The
fact that some questionable(?) process lets you create them doesn't change
the fact - if you take a disk-editor to your disk-contents, it's possible
to create a number of illegal combinations. Besides of which, I suspect
you're confusing with the "Phantom Space" as somebody else suggested
earlier. On the other hand, there's often still reason to support
non-standard behaviour - but once again, this isn't even an issue with
the patches referred to by this thread.
-Donwulff
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