Trashed Mac Files

Netware 3.12 issue:

I had a breakdown in security and one of our students(?) has deleted files
from three teacher's directories.  Most of these files were Macintosh
files.  When I use salvage I can find the files in the deleted.sav
directory and can recover them.  BUT when I try to open them with a
Macintosh they are PC files with a file type of "text".  The original
files were of several types including PowerPoint, spread sheets, databases
etc.

Anyone know of a way of salvaging these files and retaining their Mac Resources?

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Anyone know of any way I can view some "histories" to see if I can find
out who did this?

I do know that the violator logged in as supervisor (I never do this --
the supervisor password must have somehow become compromised).  I know
when it happend -- salvage reports this.  

I have my suspisions as to who was involved.  Is there anyway of finding
out what the old (I changed it of course) passwords were for Supervisor?
Who logged in when?  When security related transactions occured?  
anything else which might help me identify the *)(%$^&@#&% who did this?

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Any of you out there EXPERTS on Novell-Macintosh issues?  I might be
willing to even pay for some support?
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Thanks for any help.


David Madfes
Technology Coordinator
Abraham Lincoln High School
San Francisco, CA