I don't know your tools and specifically I don't know what a projector
in that sense actually is.
But you should normally not have a problem. Both MacOS "Classic" V1.0-V9
.2.2 and MacOS X 10.0-... use HFS or HFS+ as their file system; And both fully support the classic data and resource forks.
You should be careful, however, when compressing or mailing files with resource forks; ZIP files will usually discard the resource fork, SIT files will preserve it.
"Classic" applications (and some documents) make heavy use of the resource fork, while OS
X applications come in "bundles", basically just camouflaged folder structures without using the resource fork at all. But moving programs or data between the two platforms should not be a problem.
Changing an item's icon works in different ways between Classic and OS
X; In Classic, the icon is stored in the resource fork of the file itself, in OS
X the icon is stored in the directory as far as I remember.