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i have two possibly helps
1.-whats your operating system? windows 7,vista,xp,etc. i saw many problems come from that and you have to do something
2.-There are 2 possible ways to resolve this issue:
a.. Copy the acdb16.dll and acdb16enures.dll files from C:\Program
Files\Common Files\Autodesk Shared to the program folder for the applicable
product.
b.. Change the Start in location for the applicable product's shortcut
icon to C:\Program Files\Common Files\Autodesk shared.
So, if you could find the missing file (AcDb16ENUres.xmx) in the Autodesk
shared folder, and copy it to your 3ds folder (where acad.exe is), it
might solve the problem.
found in forums
if these dont help maybe searching whats on your 3ds files if something is missing
good luck and great dimentio =)