* utils/hbmk2/hbmk2.prg
+ MS-DOS builds got internal protection against trying to load
.hbc/.hbp/.hbm/plugin files with long filenames (only in
filename/extension part, so it's sort of a hack).
Such would result in unpredictable behavior depending on
MS-DOS OS or emulation used, but for sure none can load the
intended file.
So current hack will consider such files non-existent,
and consequently fail along the way. Please test in on
MS-DOS.