8.3
<file system, filename extension> A common shorthand for the limits on filename length imposed by the
file system used by
MS-DOS and
Microsoft Windows - at most eight characters, followed by a ".", followed by a
filename extension of at most three characters.
Windows 95 supports long filenames by using multiple directory entries per file.
The extra entries are hidden.
It also automatically derives an 8.3 name for each file for
backward compatibility so that older versions of DOS can still access the file.