Anyone that uses MrSID image files in their Map3D or Civil 3D know that you need to install the Raster Design Object Enabler or Raster Design installed to insert them with the Map image insert command. Problem is right now there is no Raster Design OE for the 2011 versions. However thanks to a geeky customer there is a work around.
The first step is you need a working version of an AutoCAD 2010 installed on your workstation. This can be Map3D, Civil 3D, Standard AutoCAD of the vanilla favor or even the water down application named TrueView. Now if you are running on a 64bit OS I was told you can skip the 2010 products but with a 32 bit OS you need one of those install.
Next download and install the 2010 version of the Raster Design OE. Located here http://usa.autodesk.com/getdoc/id=DL13023431. A reminder you need administrator rights to install it and follow the standards to install any of AutoCAD applications, in other words shut down any apps you have running and shut down you anti-virus software for the installs.
The next step is you need to open the windows registry. To do this the simple way is from the START button > Run and type in regedit for the “open” then click the OK button. Now a disclaimer, if you don’t feel comfortable working with the registry then call some that does. Do not blame the Murph if your PC starts to act up later because you messed up the registry...
Source: Map 3D and Murphs Law